Clackamas County forms the southern third of the Portland metropolitan area, containing roughly 429,000 residents across a geography that spans from dense inner-ring suburbs — Lake Oswego, West Linn, Milwaukie — through mid-county communities of Oregon City and Canby, and out to the rural Mt. Hood corridor and Cascade foothills in the east. Oregon City is the county seat and the courthouse location. Lake Oswego, not Oregon City, is the county's largest city — this distinction matters for anyone planning a physical courthouse visit or document request.
Clackamas County is the least prominently surfaced of Oregon's three Portland metro counties in most searches — Portland anchoring defaults to Multnomah, and Washington County is well-known for the Beaverton tech corridor. Clackamas residents in Lake Oswego, West Linn, and Oregon City are consistently underrepresented in searches anchored to Multnomah. Milwaukie — Clackamas County's northernmost community adjacent to Portland — frequently appears as "Portland" in database records. OJD eCourt at ojd.state.or.us covers Clackamas County Circuit Court (5th Judicial District) in the same statewide search as all other Oregon circuits. For broader Oregon and tri-county context, see our Oregon state guide.
Key takeaways
- Clackamas County has approximately 429,000 residents (U.S. Census Bureau, 2023 ACS) — Oregon's third most populous county; Oregon City is the county seat and courthouse location.
- OJD eCourt at ojd.state.or.us covers Clackamas County Circuit Court in the statewide search alongside all 27 Oregon circuit districts — no county pre-selection required.
- Milwaukie often appears as "Portland" in aggregator databases despite being in Clackamas County — ZIP codes 97222 and 97267 confirm Clackamas County for any Milwaukie address.
- Lake Oswego straddles the Multnomah-Clackamas county line — ZIP codes 97034 and 97035 are both Clackamas County; northern Lake Oswego addresses approaching Portland may require specific street-level confirmation.
Clackamas County quick facts
- Population estimate (2023): approximately 429,000 (U.S. Census Bureau, 2023 ACS)
- County seat: Oregon City
- Largest city: Lake Oswego (est. pop. 40,000)
- State: Oregon
- Primary court: Clackamas County Circuit Court (5th Judicial District)
Population estimates from the U.S. Census Bureau.
How to search Clackamas County records
Confirm Clackamas County by ZIP before routing — Milwaukie and Lake Oswego both require verification
The most common Clackamas County routing error is running a Multnomah County OJD search for an address that is actually in Clackamas County. This happens most often with Milwaukie — directly adjacent to Portland's southeast — where database records frequently show the city label as "Portland" with ZIPs 97222 or 97267. Both are Clackamas County ZIP codes. A Multnomah Circuit Court search for a Milwaukie address returns nothing. Lake Oswego requires the same check: ZIP codes 97034 and 97035 are both Clackamas County, but some northern Lake Oswego streets approach the Multnomah County boundary. For addresses in the northern Lake Oswego ZIP codes very close to Portland's outer neighborhoods, a street-level county confirmation through the Clackamas County Assessor portal at clackamas.us/at is the definitive check. Clackamas County Circuit Court covers all these addresses regardless of what city label appears in a database. Our court record search guide covers Oregon's tri-county portal structure.
Check prior Multnomah County records for Happy Valley and northern Clackamas County subjects
Happy Valley is one of the fastest-growing Oregon cities, driven by families relocating south from Portland and inner-ring Multnomah County suburbs seeking newer housing and more space. Many current Happy Valley residents have prior Multnomah County address and court histories from before the move. Milwaukie residents similarly often have prior Portland address histories given the two communities' direct adjacency. For any northern Clackamas County subject — Happy Valley, Milwaukie, Lake Oswego — the OJD eCourt statewide search covers both Clackamas and Multnomah counties simultaneously in a single query, surfacing prior Portland records alongside current Clackamas records. Filtering the OJD search to Clackamas County alone misses that prior history. Our find someone by name and city guide covers how to build the prior-county address picture before portal searches.
Route all document requests to Oregon City — not Lake Oswego
Oregon City is the Clackamas County seat and the location of the Clackamas County Circuit Court and all county administrative offices. This catches researchers who expect the courthouse to be in Lake Oswego, the county's largest city. The courthouse for all Clackamas County matters — including filings that originated in Lake Oswego, West Linn, or Milwaukie — is in Oregon City. For any Clackamas County matter requiring full case documents beyond what OJD eCourt provides as case summaries, the Oregon City courthouse is the destination. OJD eCourt handles the online index access without any physical travel. Our find someone by first and last name guide covers the identity anchoring step before any courthouse visit.
Official record sources in Clackamas County
| Record type | Agency | Online access | Notes |
|---|---|---|---|
| Felony, misdemeanor, civil, family, probate | Clackamas County Circuit Court (5th Judicial District) | OJD eCourt — ojd.state.or.us | Covered in statewide OJD eCourt search. No county pre-selection required. Prior Multnomah or Washington County records surface in the same statewide query. Full documents require Clackamas Circuit Court clerk in Oregon City. |
| City ordinance violations | Lake Oswego Municipal Court, Oregon City Municipal Court, and other city courts | Lake Oswego: ci.oswego.or.us; Oregon City: orcity.org | Separate from the circuit court. Lake Oswego and Oregon City are the most active Clackamas County municipal courts. Not included in OJD eCourt — requires separate inquiry. |
| Property records and county confirmation | Clackamas County Assessment and Taxation | clackamas.us/at | Free online search by owner name or address. Use to confirm whether a Milwaukie or Lake Oswego address is in Clackamas County before routing to circuit court. Most reliable county confirmation tool for border addresses. |
| Marriage and vital records | Clackamas County Clerk / Oregon Center for Health Statistics | clackamas.us/clerk and oregon.gov/oha/ph/birthdeathcertificates | County Clerk issues marriage licenses. Oregon OCHS maintains statewide vital records index. Certified copies require qualification and fee. |
| Arrest and booking records | Clackamas County Sheriff / city police departments | clackamas.us/sheriff | Sheriff covers county jail and unincorporated areas. Lake Oswego PD, Oregon City PD, Milwaukie PD, and other city departments maintain separate arrest records. |
| Prior Portland and Multnomah County records | Multnomah County Circuit Court | OJD eCourt — same statewide search | Prior Multnomah County records for Happy Valley, Milwaukie, and northern Clackamas subjects surface automatically in the OJD statewide search. No separate court index search required. |
For a broader overview of how public records are aggregated across jurisdictions, see our public record search guide.
Marriage records in Clackamas County
Marriage licenses in Oregon are issued by the county clerk where the license is obtained. Clackamas County Clerk issues and holds marriage licenses, with records accessible at clackamas.us/clerk. Oregon Center for Health Statistics maintains a statewide vital records index — certified copies require proper qualification and a fee through oregon.gov/oha/ph/birthdeathcertificates or by mail.
Some current Clackamas County residents married in Multnomah County before moving to the southern metro. Those marriage records are with the Multnomah County Clerk. Oregon OCHS statewide covers all Oregon counties for certified copy requests. For a full guide to how marriage record searches work across all states, see our marriage record search guide.
Divorce records in Clackamas County
Divorce cases in Oregon are filed in Circuit Court in the county of residence. Clackamas County Circuit Court handles dissolution filings for county residents, with case indexes searchable through OJD eCourt at ojd.state.or.us. Oregon requires 6 months of state residency before filing. Full documents require contact with the Clackamas County Circuit Court clerk in Oregon City.
Some current Clackamas County residents have prior dissolution filings from when they lived in Portland — those records are in Multnomah County Circuit Court. OJD eCourt statewide covers both counties in the same search. For a full guide to how divorce record searches work across all states, see our divorce record search guide.
Industry insight
Clackamas County is the most consistently overlooked county in Portland metro searches. When I get a clean result from a Multnomah-anchored search for a subject I know lives in Lake Oswego, West Linn, or even Milwaukie, the cause is almost always that the search was in the wrong county. Milwaukie shows up as "Portland" in a lot of databases. Lake Oswego sits right on the county line. And most people doing a Portland metro search just default to Multnomah without confirming the specific county. The Clackamas County Assessor portal at clackamas.us/at confirms county in under a minute for any specific address — it's the fastest tool for resolving the Milwaukie and Lake Oswego boundary questions.
Happy Valley is the other pattern worth knowing. The city has grown rapidly as families have moved south from Portland and inner-ring suburbs. Many current Happy Valley residents have five-plus years of prior Multnomah County records from before the move. OJD statewide covers both counties in one search — but only if you don't pre-filter to Clackamas. I run the unfiltered statewide search for any Happy Valley or northern Clackamas County subject and let the county identification in the returned results tell me which courthouse matters for document retrieval.
Common mistakes when searching in Clackamas County
- Routing a Milwaukie "Portland" postal address to Multnomah Circuit Court — Milwaukie is in Clackamas County. ZIP codes 97222 and 97267 confirm Clackamas County regardless of any "Portland" city label. A Multnomah search for Milwaukie returns nothing.
- Assuming Lake Oswego is in Multnomah County — the majority of Lake Oswego, including ZIPs 97034 and 97035, is in Clackamas County. For records routing, Clackamas County Circuit Court is correct for most Lake Oswego addresses. Confirm by ZIP or the Clackamas County Assessor portal for northern Lake Oswego addresses near the county boundary.
- Expecting the courthouse to be in Lake Oswego — Oregon City is the county seat and courthouse location, not Lake Oswego. For any Clackamas County matter requiring full case documents, the destination is the Clackamas County Circuit Court in Oregon City.
- Filtering OJD to Clackamas County for Happy Valley or Milwaukie subjects with prior Portland history — OJD statewide covers both Clackamas and Multnomah in the same search. Pre-filtering to Clackamas misses the prior Multnomah records. Always run the unfiltered statewide search first.
Clackamas County court system overview
Clackamas County Circuit Court (5th Judicial District) covers only Clackamas County and handles all felony criminal, civil, family law, and probate matters. The courthouse is in Oregon City. Case summaries are accessible through OJD eCourt; full documents require contact with the circuit court clerk. Lake Oswego Municipal Court and Oregon City Municipal Court are the most active city courts for ordinance matters, but multiple Clackamas County cities maintain their own municipal courts. These are not accessible through OJD eCourt.
Crime statistics and public-safety context
Clackamas County's crime rates vary considerably across its geographic range. Lake Oswego and West Linn report among the lowest per-capita crime rates in the Portland metro — among the lowest in Oregon for communities of their size. Oregon City and Milwaukie report moderate rates closer to regional averages. Happy Valley and newer eastern suburbs are low-volume given their recent and relatively affluent growth character. The rural eastern portions of the county — Sandy, Estacada, the Mt. Hood corridor — see low absolute crime volumes with limited court filing activity. Source: Oregon Criminal Justice Commission, Oregon Crime Statistics 2023.
Major cities in Clackamas County
Lake Oswego
Lake Oswego (est. pop. 40,000 — U.S. Census Bureau, 2023 ACS) is the county's largest city and one of Oregon's most affluent communities. It straddles the Multnomah-Clackamas boundary — ZIPs 97034 and 97035 are Clackamas County; northern Lake Oswego streets approaching Portland may be in Multnomah. The Clackamas County Assessor portal resolves any specific address. Lake Oswego's stable, high-homeownership population produces reliable long-term address histories with low criminal court filing rates.
Oregon City
Oregon City (est. pop. 40,000 — U.S. Census Bureau, 2023 ACS) is the county seat and courthouse location at the southern end of the county where the Willamette River meets the Clackamas River. Clackamas County Circuit Court is here. Oregon City has a more working-class character than the county's affluent northern suburbs, with higher per-capita court filing rates. Its historic role means property records extend further back than in newer suburban areas.
West Linn
West Linn (est. pop. 28,000 — U.S. Census Bureau, 2023 ACS) is south of Lake Oswego on the Willamette's west bank. In Clackamas County Circuit Court jurisdiction. High homeownership rates and stable long-term residential profiles produce address histories among the most reliable in the Portland metro. Very low criminal court filing rates relative to population.
Milwaukie
Milwaukie (est. pop. 21,000 — U.S. Census Bureau, 2023 ACS) is directly south of Portland in northern Clackamas County and is the county's most commonly misidentified city. Database records frequently show "Portland" as the city for Milwaukie addresses. ZIP codes 97222 and 97267 confirm Clackamas County. Many Milwaukie residents have prior Portland addresses given the direct adjacency — OJD statewide captures both without a separate search.
Happy Valley
Happy Valley (est. pop. 28,000 — U.S. Census Bureau, 2023 ACS) is a fast-growing eastern suburb southeast of Portland in the county's foothills. One of Oregon's fastest-growing cities over the past decade, driven by families seeking suburban space at lower cost than the inner Portland metro. Many current Happy Valley residents relocated from Multnomah County within the past 5-10 years and have substantive prior Multnomah records. OJD statewide covers both counties — running the unfiltered search captures the complete picture.
Common search scenarios
Searching by name and city in Clackamas County
Confirm county by ZIP before running OJD eCourt — especially for Milwaukie (97222/97267) and Lake Oswego (97034/97035). Use the Clackamas County Assessor portal for any address where the county is uncertain. Run OJD eCourt statewide without a county filter to capture both current Clackamas County records and any prior Multnomah County records in one query. See our guide on finding someone by name and city.
Checking Clackamas County court records
OJD eCourt statewide → confirm Clackamas County in results → Clackamas County Circuit Court clerk in Oregon City for full documents → Clackamas County Assessment and Taxation for property-based address confirmation → Lake Oswego or Oregon City Municipal Court for ordinance matters if needed. See our court record search guide.
Searching for a Happy Valley subject with prior Portland history
OJD statewide covers Multnomah and Clackamas counties simultaneously. Prior Portland records surface alongside current Happy Valley Clackamas records in the same query — no separate search needed for the court index. Property records from the prior Portland address require the Multnomah County Assessor separately. A name and relative search through an aggregator typically surfaces the full prior-county address chain quickly.
Start Here: Enter Any Name To View Records
Best sites to review first
Before running OJD eCourt for Clackamas County, these are the two services I recommend reviewing first — particularly for Milwaukie county confirmation and prior Multnomah County history for Happy Valley subjects.
| Service | Why people use it | Best fit |
|---|---|---|
| Instant Checkmate | Aggregates address history across Clackamas and Multnomah counties — confirms county for Milwaukie and Lake Oswego boundary addresses and surfaces prior Portland records for Happy Valley subjects | County confirmation and prior Multnomah identification before OJD eCourt for northern Clackamas County subjects |
| TruthFinder | Address timeline across the Portland tri-county metro — tracing moves from Portland and Multnomah County to southern metro Clackamas communities | Subjects who relocated from Portland or inner-ring Multnomah suburbs to Lake Oswego, West Linn, or Happy Valley |
Important: These services are not FCRA-compliant consumer reporting agencies. Do not use them for employment screening, tenant decisions, insurance underwriting, or any other purpose regulated by the Fair Credit Reporting Act.
Frequently asked questions
Is Milwaukie in Clackamas County or Multnomah County?
Milwaukie is in Clackamas County. Despite being directly adjacent to Portland's southeast and carrying "Portland" postal labels in many databases, Milwaukie is an incorporated city in Clackamas County. Its court records are in Clackamas County Circuit Court, its property records are with the Clackamas County Assessor, and it is policed by Milwaukie Police and the Clackamas County Sheriff. ZIP codes 97222 and 97267 confirm Clackamas County for any Milwaukie address.
Does Lake Oswego straddle the county line?
Yes. Lake Oswego sits at the Multnomah-Clackamas county boundary. The majority of the city, including ZIP codes 97034 and 97035, is in Clackamas County. Some northern Lake Oswego streets approaching Portland neighborhoods are in Multnomah County. For most Lake Oswego records purposes, Clackamas County Circuit Court is correct. The Clackamas County Assessor portal at clackamas.us/at confirms county for any specific Lake Oswego address in under a minute.
Where is the Clackamas County courthouse?
Clackamas County Circuit Court is located in Oregon City, the county seat, in the southern part of the county. Oregon City is not the county's largest city — Lake Oswego is — but as the county seat it houses the District Court and all county administrative offices. For any Clackamas County matter requiring full case documents, Oregon City is the destination. OJD eCourt provides online case summary access without requiring a courthouse visit.
Should I check Multnomah County for a Clackamas County subject?
OJD eCourt statewide covers both Clackamas and Multnomah counties in a single search — no separate portal search is needed for the court index. Prior Multnomah County records for Happy Valley, Milwaukie, or Lake Oswego subjects who moved from Portland surface automatically in the statewide query. Only when requesting full case documents does the county matter for routing to the Oregon City or Portland courthouse.
Where do I find marriage and divorce records for Clackamas County?
Marriage licenses are issued by Clackamas County Clerk at clackamas.us/clerk. Oregon OCHS maintains a statewide vital records index at oregon.gov/oha/ph/birthdeathcertificates — certified copies require qualification and a fee. Divorce records are in Clackamas County Circuit Court, searchable through OJD eCourt. Full documents require contact with the Clackamas County Circuit Court clerk in Oregon City. Prior marriages or divorces from when a subject lived in Portland are in Multnomah County records.
How do I find property records for Clackamas County?
Clackamas County Assessment and Taxation at clackamas.us/at provides free online searches by owner name or address for ownership, assessed value, and transfer history. The portal is particularly useful as a county confirmation tool — if an address appears in the Clackamas County assessment system, it is in Clackamas County regardless of any city label or postal designation. This resolves both the Milwaukie and Lake Oswego boundary questions definitively.
Can I use these searches for jobs, housing, or insurance decisions?
No. The services discussed on this page are not consumer reporting agencies and the information here is not a consumer report. They should not be used for employment, tenant screening, insurance underwriting, credit, or any other purpose regulated by the Fair Credit Reporting Act.
Other Oregon county guides
