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County · code 06109

Tuolumne CountyCalifornia

Tuolumne County is a county in California with its seat in Sonora, created in 1850.

  • Founded1850
  • County seatSonora
  • Land area2,221 sq mi + 54 sq mi water
  • Population55,620 2020 Census
  • Parcels mapped48,314 checked 16 October 2026
Open the free map Click any parcel in Tuolumne County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated

MariposaAlpineCalaverasMaderaMonoMercedStanislaus Sonora Census outline · seat marked

Where it is

Tuolumne 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 CountyLake 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 CountyVentura CountyYolo CountyYuba CountyTuolumne County Tuolumne
Counties of California · Tuolumne highlighted

History

Founded in 1850

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

Tuolumne County was created on February 18, 1850 from non-county area. The county lost territory to the creation of Stanislaus County in 1854, to the creation of Fresno County in 1856, and to the creation of Alpine County in 1864, though it gained back territory from Fresno County in 1859.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries; the 5 that matter most are shown first.

  1. 1850
    Tuolumne County created Tuolumne created from non-county area. · Calif. Stats. 1849, 1st sess., ch. 15, sec. 27/p. 63
  2. 1854
    Lost territory Tuolumne lost to creation of Stanislaus.
    to Stanislaus
    · Calif. Stats. 1854, 5th sess., chs. 35, 81/pp. 40-41, 191-194
  3. 1856
    Lost territory Tuolumne lost to creation of Frezno (now Fresno).
    to Freznoto Fresno
    · Calif. Stats. 1856, 7th sess., ch. 127/pp. 183
  4. 1859
    Gained territory Tuolumne gained from Frezno (now Fresno).
    from Freznofrom Fresno
    · Calif. Stats. 1859, 10th sess., ch. 204/p. 213
  5. 1864
    Lost territory Tuolumne lost to creation of Alpine.
    to Alpine
    · Calif. Stats. 1863-1864, 15th sess., ch. 180/pp. 178-182
Show all 8 changes (3 more, mostly small adjustments)
  1. 1850
    Tuolumne County created Tuolumne created from non-county area. · Calif. Stats. 1849, 1st sess., ch. 15, sec. 27/p. 63
  2. 1850
    Boundary clarified Tuolumne boundaries clarified (no change).
    no change
    · Calif. Stats. 1849, 1st sess., ch. 111/pp. 262-263
  3. 1851
    Boundary clarified Tuolumne boundaries redefined (no change).
    no change
    · Calif. Stats. 1851, 2d sess., ch. 14, sec. 14/p. 175
  4. 1854
    Lost territory Tuolumne lost to creation of Stanislaus.
    to Stanislaus
    · Calif. Stats. 1854, 5th sess., chs. 35, 81/pp. 40-41, 191-194
  5. 1855
    Boundary clarified Boundary between Tuolumne and Stanislaus clarified (no change).
    with Stanislausno change
    · Calif. Stats. 1855, 6th sess., ch. 194/p. 245
  6. 1856
    Lost territory Tuolumne lost to creation of Frezno (now Fresno).
    to Freznoto Fresno
    · Calif. Stats. 1856, 7th sess., ch. 127/pp. 183
  7. 1859
    Gained territory Tuolumne gained from Frezno (now Fresno).
    from Freznofrom Fresno
    · Calif. Stats. 1859, 10th sess., ch. 204/p. 213
  8. 1864
    Lost territory Tuolumne lost to creation of Alpine.
    to Alpine
    · Calif. Stats. 1863-1864, 15th sess., ch. 180/pp. 178-182

Land and parcels

What the maps cover in Tuolumne

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

Tuolumne by the Census

Population
55,620 2020 Census count
Housing units
31,415 2020 Census count
Land area
2,221 square miles
Water area
54 square miles
People per sq mi
25 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

Tuolumne County's official site

We have found the county's site but not its offices yet; start there.

County government

See your own lot on these maps

Open Tuolumne 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.

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Questions

Common questions about Tuolumne County

When was Tuolumne County founded?
Tuolumne County was founded in 1850.
What is the county seat of Tuolumne County?
The county seat of Tuolumne County is Sonora.
Is there an online parcel map for Tuolumne County?
Yes. Tuolumne County publishes a parcel map of 48,314 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Tuolumne County's boundary or name changed?
Tuolumne County was created in 1850. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Fresno County, Frezno County and Alpine County.
Is my lot in a flood zone?
We do not have flood maps for Tuolumne 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