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County Formation Maps
(Maps made with the use AniMap Plus County Boundary Historical Atlas v. 2.5 (Win)
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18501851185218531854185518561857185918601861186318641866
1868
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1907
19091913191719191925

Map Abbreviations

unorg. = unorganized
g. = gained
w. = with
fr. = from
atmt. = attachment
exch = exchanged
nca.= non county area
ch. = changed

Ala - Alameda
Alp - Alpine
Am - Amador
But - Butte
Ca - Calaveras
CC - Contra Costa
Col - Colusa
Cos - Coso
Csi - Colusi
DN - Del Norte
ED - El Dorado
Fr - Fresno
Gl - Glenn
Hu - Humboldt
Im - Imperial
In - Inyo
Ke - Kern
Ki - Kings
Kl - Klamath
LA - Los Angeles
Lak - Lake
Las - Lassen
Mad - Madera
Men - Mendocino
Mer - Merced
Mno - Mono
Mnt - Monterey
Mod - Modoc
Mrn - Marin
Mrs - Mariposa
Na - Napa
Ne - Nevada
Or - Orange
Pa - Pautah
Pla - Placer
Plu - Plumas
Ri - Riverside
Sac - Sacramento
SBr - San Bernardino
SBt - San Benito
SCl - Santa Clara
Scr - Santa Cruz
SD - San Diego
SF - San Francisco
Sh - Shasta
Sie - Sierra
Sis - Siskiyou
SJ - San Joaquin
SLO - San Luis Obispo
SM - San Mateo
Sol - Solano
Son - Sonoma
St - Stanislaus
StB - Santa Barbara
Su - Sutter
Te - Tehama
Tr - Trinity
Tul - Tulare
Tuo - Tuolomne
Ve - Ventura
Yo - Yolo
Yu - Yuba
County Census Records

   Genealogy Atlas has images of old American atlases during the years 1795, 1814, 1822, 1823, 1836, 1838, 1845, 1856, 1866, 1879 and 1897 for Ohio and other states.
   You can view rotating animated maps for California showing all the county boundaries for each census year overlayed with past and present maps so you can see the changes in county boundaries. You can view a list of maps for other states at Census Maps
   You can view rotating animated maps for California showing all the county boundary changes for each year overlayed with past and present maps so you can see the changes in county boundaries . You can view a list of maps for other states and State Department of Transportation Maps at County Maps.

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