| ZIP Codes: | 21 ZIP Codes (11 Standard, 7 PO Box, 3 Unique) [See All] |
| Area Codes: | 360 / 564 |
| Timezone: | Pacific (GMT -08:00) |
| Local Time: | 2:14:17 PM |
| Population: | 297,238 [See All] |
| FIPS: | 53067 |
| CBSA: | Olympia-Lacey-Tumwater, WA |
| Land Area: | 772 sq mi |
| Water Area: | 41 sq mi |
| Coordinates: | 46.9785, -122.8659 |
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297,238 residents live across 21 ZIPs covering 772 sq mi, served by 10 distinct USPS-recognized cities.
Population moved from 257,744 to 296,007 from 2014 to 2024 — a +14.8% change. 11 ZIPs gained residents, 1 lost.
The county's wealthiest ZIP 98513 (Olympia, $113,053 median) and poorest ZIP 98589 (Tenino, $83,855) are 10.9 miles apart — a 1.3× income gap across local geography.
Median home values vary 1.3× across this county — from $438,100 in 98503 (Lacey) to $572,500 in 98516 (Olympia).
Density varies 58× across the county — from 60 people/sq mi in 98576 (Rainier) to 3,454 in 98503 (Lacey).
Most of the decade's growth concentrated around Olympia — top growth ZIPs averaged +25.0% over the past ten years ( 98516 , 98597 and 98501 ).
Educational attainment ranges from 20.6% bachelor's+ in 98579 (Rochester) to 52.0% in 98502 (Olympia) — the breadth of educational profiles across the area.
Within Washington, this is the #6 most populous of 39 counties and ranks #7 for median household income with the #10 fastest decade growth .
Hosts 3 single-entity Unique ZIPs: 98505Evergreen State College ; 98599Olympia Brm ; and 98504Washington State Department .
Weighted by population, the typical household earns about $97,203 across the county — reflecting what a typical resident sees, not a simple ZIP average.
38.5% of adults age 25+ hold a bachelor's degree or higher (82,030 of 212,818 reporting). The most-educated ZIPs cluster around Olympia.
11 Standard delivery, 7 PO Box only, 3 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 98501 | Olympia | Standard | 48,067 | $97,198 | 36.3 | 18.3% |
| 98503 | Lacey | Standard | 41,656 | $89,002 | 12.1 | 13.4% |
| 98513 | Olympia | Standard | 38,017 | $113,053 | 68.7 | 12.5% |
| 98502 | Olympia | Standard | 35,398 | $92,207 | 55.7 | 16.8% |
| 98512 | Olympia | Standard | 31,864 | $101,530 | 145.3 | 11.3% |
| 98516 | Olympia | Standard | 29,177 | $98,892 | 28.9 | 34.4% |
| 98597 | Yelm | Standard | 26,669 | $92,219 | 123.2 | 22.1% |
| 98506 | Olympia | Standard | 18,497 | $91,596 | 23.1 | 1.1% |
| 98579 | Rochester | Standard | 14,048 | $99,411 | 95.9 | 4.1% |
| 98589 | Tenino | Standard | 7,010 | $83,855 | 96.5 | -1.8% |
| 98576 | Rainier | Standard | 4,985 | $104,896 | 83.6 | 6.3% |
| 98505 | Olympia | Unique | 881 | — | 0.3 | — |
| 98530 | Bucoda | PO Box | 619 | $80,682 | 2.8 | 18.6% |
| 98556 | Littlerock | PO Box | 350 | — | 0.0 | — |
| 98540 | East Olympia | PO Box | — | — | 0.0 | — |
| 98511 | Tumwater | PO Box | — | — | 0.0 | — |
| 98509 | Lacey | PO Box | — | — | 0.0 | — |
| 98599 | Olympia | Unique | — | — | 0.0 | — |
| 98504 | Olympia | Unique | — | — | 0.0 | — |
| 98507 | Olympia | PO Box | — | — | 0.0 | — |
| 98508 | Olympia | PO Box | — | — | 0.0 | — |