Napa County, California
Napa County, California, has 132,949 residents (July 2025 estimate). Its county seat is Napa. It uses Pacific Time and covers 752 sq mi (1,948 km²) of land.
- Resident population, July 2025
- 132,949
- Land area
- 752 sq mi (1,948 km²)
- County seat or government
- Napa
- Time zone
- Pacific TimeUTC-08:00 in January; UTC-07:00 in July
- Median household income
- $111,471 ± $4,025
- Median home value
- $869,500 ± $15,451
- Median rent, with utilities
- $2,237 ± $56
- Homes lived in by their owners
- 63.4% ± 3.4 points
- County type
- County
- Metro or micro area
- Napa, CA metro areaCentral county
- Water area
- 40.3 sq mi (104 km²)
- State
- California
- County code (FIPS)
- 06055
- Coordinates (central point)
- 38.507100, -122.325904
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Napa County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Pacific TimeAmerica/Los_Angeles | UTC-08:00 in January; UTC-07:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 9455863,657 people
- 9459158,193 people
- 9568840,201 people
- 9547635,196 people
- 9455927,714 people
- 9450321,841 people
- 945747,457 people
- 945156,946 people
- 945083,495 people
- 954423,449 people
- 954613,422 people
- 945993,348 people
17 ZIP Code areas overlap Napa County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Napa County, largest first
- Fairfield-Suisun Unified School District140,650 people
- Napa Valley Unified School District115,733 people
- St. Helena Unified School District8,231 people
- Calistoga Joint Unified School District6,943 people
- Howell Mountain Elementary School District3,495 people
- Pope Valley Union Elementary School District734 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Napa, California (city)78,239 people
- American Canyon, California (city)21,691 people
- St. Helena, California (city)5,318 people
- Calistoga, California (city)5,111 people
- Yountville, California (city)3,348 people
- Angwin, California (CDP)2,931 people
- Silverado Resort, California (CDP)892 people
- Deer Park, California (CDP)720 people
- Moskowite Corner, California (CDP)225 people
- Rutherford, California (CDP)84 people
- Oakville, California (CDP)0 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Yolo County, California26 mi northeast
- Solano County, California27 mi southeast
- Sonoma County, California32 mi west
- Lake County, California47 mi northwest
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county where you are now, check its ZIP area, or check the time zone where you are.
Areas that only touch the edge
These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.