When was Amador County founded?

Amador County was founded in 1854, formed from Calaveras County, and named after José María Amador.

What is the county seat of Amador County?

The county seat of Amador County is Jackson.

Is there an online parcel map for Amador County?

Yes. A public source publishes a parcel map of 24,565 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Amador County's boundary or name changed?

Amador County was created in 1854 from Calaveras County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving El Dorado County, Alpine County and Mono County.

Is my lot in a flood zone?

We do not have flood maps for Amador County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

County · code 06005

Amador CountyCalifornia

Amador County is a county in California, formed in 1854 from Calaveras County with Jackson as its seat. The county was named after José María Amador.

Founded1854
County seatJackson
Named forJosé María Amador
Land area595 sq mi + 11 sq mi water
Population40,474 2020 Census
Parcels mapped24,565 checked 16 October 2026

Open the free map Click any parcel in Amador County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1854 from Calaveras County

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

Amador County was created on June 14, 1854, from Calaveras County through an act passed May 11, 1854, confirmed by referendum. The county's boundaries changed several times over the next century: it gained and exchanged territory with El Dorado County multiple times between 1855 and 1863, lost land to the creation of Alpine County in 1864, and lost additional territory to Mono and Alpine Counties in 1866. In the late 20th century, Amador gained a small area from El Dorado County in 1991 and lost a small area to Alpine County in 1995.

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

1854
Amador County created Amador created from Calaveras. Act passed 11 May 1854; referendum for or against creation of the new county held 14 June 1854.
from Calaveras
14 June 1854 · Calif. Stats. 1854, 5th sess., ch. 42/pp. 45-48
1855
Gained territory Amador gained from El Dorado.
from El Dorado
16 April 1855 · Calif. Stats. 1855, 6th sess., ch. 92/p. 113
1857
Exchanged territory Amador exchanged with El Dorado.
with El Dorado
25 April 1857 · Calif. Stats. 1857, 8th sess., ch. 220/p. 251
1863
Gained territory Amador gained from El Dorado.
from El Dorado
8 April 1863 · Calif. Stats. 1863, 14th sess., ch. 170/p. 231
1864
Lost territory Amador lost to creation of Alpine.
to Alpine
16 March 1864 · Calif. Stats. 1863-1864, 15th sess., ch. 180/pp. 178-182

Show all 9 changes (4 more, mostly small adjustments)

1854
Amador County created Amador created from Calaveras. Act passed 11 May 1854; referendum for or against creation of the new county held 14 June 1854.
from Calaveras
14 June 1854 · Calif. Stats. 1854, 5th sess., ch. 42/pp. 45-48
1855
Gained territory Amador gained from El Dorado.
from El Dorado
16 April 1855 · Calif. Stats. 1855, 6th sess., ch. 92/p. 113
1855
Boundary clarified Amador boundaries redefined (no change).
no change
23 April 1855 · Calif. Stats. 1855, 6th sess., ch. 113/p. 134-135
1857
Exchanged territory Amador exchanged with El Dorado.
with El Dorado
25 April 1857 · Calif. Stats. 1857, 8th sess., ch. 220/p. 251
1863
Gained territory Amador gained from El Dorado.
from El Dorado
8 April 1863 · Calif. Stats. 1863, 14th sess., ch. 170/p. 231
1864
Lost territory Amador lost to creation of Alpine.
to Alpine
16 March 1864 · Calif. Stats. 1863-1864, 15th sess., ch. 180/pp. 178-182
1866
Lost territory Amador lost to Mono the remnant of territory that was left separate from Amador by the creation of Alpine.
to Mono to Alpine
2 March 1866 · Calif. Stats. 1865, 16th sess., ch. 161/p. 144
1991
Gained territory Amador gained small area from El Dorado. Ordinance passed 25 June 1991; effective 30 June 1991.
from El Dorado
30 June 1991 · Minutes of the Board of Supervisors, El Dorado County, 25 June 1991, resolution 211-91; Minutes of the Board of Supervisors, Amador County, 12 June 1990, resolution 90-182
1995
Lost territory Amador lost small area to Alpine. Ordinance passed 3 October 1995; effective 17 November 1995.
to Alpine
17 November 1995 · Minutes of the Board of Supervisors, Amador County, 3 October 1995, ordinance 1390

Land and parcels

What the maps cover in Amador

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

Parcels Good enough

Lot lines and tax-map numbers for 24,565 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 15 October 2026 · checked 16 October 2026
Address points Missing

No public address points layer found for Amador County yet.
Buildings Reference

Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026

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

Amador by the Census

Population

40,474 2020 Census count

Housing units

18,805 2020 Census count

Land area

595 square miles

Water area

11 square miles

People per sq mi

68 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

Amador County's official site

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

County government

County government
The official website of Amador County.
amadorcounty.gov

See your own lot on these maps

Open Amador 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 Amador County

When was Amador County founded?: Amador County was founded in 1854, formed from Calaveras County, and named after José María Amador.
What is the county seat of Amador County?: The county seat of Amador County is Jackson.
Is there an online parcel map for Amador County?: Yes. A public source publishes a parcel map of 24,565 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Amador County's boundary or name changed?: Amador County was created in 1854 from Calaveras County. Since then the Atlas of Historical County Boundaries records 7 later changes, chiefly involving El Dorado County, Alpine County and Mono County.
Is my lot in a flood zone?: We do not have flood maps for Amador County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby