Alabama entered the union as the twenty-second (22nd) state on December
14, 1819. Prior to that time, this area was part of the Mississippi
Territory and Indian lands. Its earliest counties -- Washington, Madison,
Baldwin, Clarke, Mobile, Monroe, and Montgomery -- were formed from
the Mississippi Territory.
The first census to enumerate the state of Alabama was in 1820. State
Censuses began in 1820 - counties of Baldwin, Conecuh, Dallas, Franklin,
Limestone, St. Clair, Shelby, and Wilcox; in 1850 - all counties in
1855 - counties of Autauga, Baldwin, Blount, Coffee, Franklin, Henry,
Lowndes, Macon, Mobile, Pickens, Tallapoosa, Tuscaloosa and in 1866
- all counties.
About
U.S. Census Population Schedules includes helpful
tips for specific census years
CensusFinder.com
- Alabama has free census resources for this state,
including census records by county, census notes, census cd info..
The
Basics of Using Federal Census Records
useful introduction to using census records by George
G Morgan
Interpreting the Tick Marks on Federal Censuses 
download and print out these free handy census forms to keep a record
of ancestors that you discover in US censuses (courtesy Ancestry.com)
1790 census form 1800
census form 1810
census form 1820
census form 1830
census form 1840
census form 1850
census form 1860
census form 1870
census form 1880
census form 1890
census form 1900
census form 1910
census form 1920
census form 1930
census form
(requires Adobe Acrobat- if you don't have it get it
free here)
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