Parcel Chartplaces Open the free map

County · code 06033

Lake CountyCalifornia

Lake County is a county in California, with its seat at Lakeport.

  • Founded1861
  • County seatLakeport
  • Named forClear Lake, California
  • Land area1,257 sq mi + 73 sq mi water
  • Population68,163 2020 Census
  • Parcels mapped64,035 checked 15 October 2026
Open the free map Click any parcel in Lake County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

ColusaSonomaGlennNapaMendocinoYolo Lakeport Census outline · seat marked

Where it is

Lake on the map of California

California has 58 counties and county equivalents, each with its own records office. Shapes with a page are links.

Alameda CountyAlpine CountyAmador CountyButte CountyCalaveras CountyColusa CountyContra Costa CountyDel Norte CountyEl Dorado CountyFresno CountyGlenn CountyHumboldt CountyImperial CountyInyo CountyKern CountyKings CountyLassen CountyLos Angeles CountyMadera CountyMarin CountyMariposa CountyMendocino CountyMerced CountyModoc CountyMono CountyMonterey CountyNapa CountyNevada CountyOrange CountyPlacer CountyPlumas CountyRiverside CountySacramento CountySan Benito CountySan Bernardino CountySan Diego CountySan Francisco CountySan Joaquin CountySan Luis Obispo CountySan Mateo CountySanta Barbara CountySanta Clara CountySanta Cruz CountyShasta CountySierra CountySiskiyou CountySolano CountySonoma CountyStanislaus CountySutter CountyTehama CountyTrinity CountyTulare CountyTuolumne CountyVentura CountyYolo CountyYuba CountyLake County Lake
Counties of California · Lake highlighted

History

Formed in 1861 from Napa County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Lake County was created from Napa County on May 20, 1861, and named after Clear Lake. The county's boundaries changed several times in the 19th and early 20th centuries through gains and losses to neighboring counties including Mendocino, Colusa, and Yolo.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

  1. 1861
    Lake County created Lake created from Napa.
    from Napa
    · Calif. Stats. 1861, 12th sess., ch. 498/pp. 560-561
  2. 1864
    Gained territory Lake gained from Mendocino and Napa.
    from Mendocinofrom Napa
    · Calif. Stats. 1863-1864, 15th sess., ch. 122/p. 111
  3. 1868
    Gained territory Lake gained from Colusa, Napa, and Yolo.
    from Colusafrom Napafrom Yolo
    · Calif. Stats. 1867, 17th sess., ch. 257/p. 269
  4. 1872
    Lost territory Lake lost to Napa.
    to Napa
    · Calif. Stats. 1871, 19th sess., ch. 229/p. 305
  5. 1907
    Lost territory Lake lost to Mendocino.
    to Mendocino
    · Calif. Stats. 1907, 37th sess., ch. 113/p. 135
  6. 1909
    Exchanged territory Lake exchanged with Glenn; boundary of Lake with Colusa and Mendocino redefined (no change).
    with Glennwith Colusawith Mendocino
    · Calif. Stats. 1909, 38th sess., ch. 211/pp. 326-328
  7. 1917
    Exchanged territory Lake exchanged with Mendocino.
    with Mendocino
    · Calif. Stats. 1917, 42d sess., ch. 779/pp. 1635-1640

Land and parcels

What the maps cover in Lake

Who publishes each layer, how good it is, and when we last checked.

Official
from the office that keeps the record
Good enough
a reliable statewide or national copy
Fallback
a guide only; check the official record
Missing
nothing public found yet

People and land

Lake by the Census

Population
68,163 2020 Census count
Housing units
34,220 2020 Census count
Land area
1,257 square miles
Water area
73 square miles
People per sq mi
54 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Records

Permits

Zoning and code

County government

See your own lot on these maps

Open Lake County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

Open the free map no sign-in Pro early access

Questions

Common questions about Lake County

When was Lake County founded?
Lake County was founded in 1861, formed from Napa County, and named after Clear Lake, California.
What is the county seat of Lake County?
The county seat of Lake County is Lakeport.
Is there an online parcel map for Lake County?
Yes. Lake County publishes a parcel map of 64,035 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Lake County's boundary or name changed?
Lake County was created in 1861 from Napa County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Mendocino County, Napa County and Colusa County.
Who issues building permits in Lake County?
The county's page on building permits: Permits. Inside a city or town, ask that city first.
Who issues septic and well permits in Lake County?
The county's page on septic systems and wells: Behavioral Health Services.
Is my lot in a flood zone?
We do not have flood maps for Lake County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Counties next door