Franklin County, Washington
County seat: Pasco · Population 102,612 (2025) · 1,242 sq mi
Franklin County is the 14th most populous of Washington's 39 counties, with 102,612 people (2025 estimate). Its county seat is Pasco. The map shows its 4 cities and towns and the 6 neighboring counties.
Franklin County facts
- County seat
- Pasco
- Population (2025 estimate)
- 102,612 +6.1% since 2020
- Land area
- 1,242 sq mi 27th largest of 39
- Water area
- 23 sq mi
- Population density
- 83 per sq mi
- Established
- 1883
- Same name
- One of 24 Franklin Counties in the US
- Named after
- Benjamin Franklin American polymath and statesman (1706–1790)
- Largest city
- Pasco 82,848
- Median household income
- $86,714
- Cities and towns
- 4 plus 2 CDPs
- ZIP codes
- 7
- Time zone
- Pacific
- FIPS code
- 53021
Cities and towns in Franklin County
Franklin County has 4 incorporated cities, towns and villages. Populations count the people living inside Franklin County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Pasco (county seat) | City | 82,848 | |
| Connell | City | 5,080 | |
| Mesa | City | 391 | |
| Kahlotus | City | 141 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Basin City | 1,176 | |
| West Pasco | 1,122 |
ZIP codes in Franklin County
7 ZIP codes reach into Franklin County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 99301
- 99326 also Adams County
- 99330
- 99335
- 99343
- 99344 also Adams and Grant counties
- 99371 also Adams County
Population of Franklin County, 2020–2025
Franklin County grew by 5,867 people (+6.1%) between April 2020 and July 2025: 4,685 more births than deaths and a net gain of 1,091 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 97,137 |
| 2021 | 98,096 |
| 2022 | 98,445 |
| 2023 | 99,683 |
| 2024 | 101,386 |
| 2025 | 102,612 |
Neighboring counties
- Walla Walla County southeast · 62,361 people
- Adams County northeast · 21,488 people
- Benton County southwest · 221,722 people
- Whitman County east · 48,512 people
- Grant County northwest · 105,727 people
- Columbia County east · 4,141 people
Printable Franklin County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (111 KB)
- PNG (2400 px) (72 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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