From the Guide to 2010 State and Local Census Geography — Alabama History:

The area of Alabama north of the 31st parallel was part of the original territory of the United States. The northern two-thirds were a part of Georgia until 1802. The southern one-third of the territory north of the 31st parallel was unorganized until 1798 with the creation of Mississippi Territory. The United States claimed the territory south of the 31st parallel as part of the Louisiana Purchase in 1803, but did not formally acquire this territory from Spain until 1812. Alabama Territory was organized from the eastern part of Mississippi Territory on March 3, 1817, with generally the same boundary as the present state.

Data for the legally established state of Alabama are available beginning with the 1820 census.

From QuickFacts: statistics for all states and counties, and for cities and towns with a population of 5,000 or more.

Note: The dashboard shown above is cropped at the bottom. Click on the image to see the full dashboard. Click here to see the table view showing the United States, Alabama, Birmingham city, Montgomery city (state capital), Huntsville city, Mobile city.

Sources: 2018 Population and Housing Unit Estimates; 2013-2017 American Community Survey, 5-Year Estimates; 2010 Census.

Community Facts - Find popular facts (population, income, etc.) and frequently requested data about your community.

Source: 2018 Population and Housing Unit Estimates.

Source: 2018 American Community Survey, 1-Year Estimates.

From the Statistics in Schools program:

From Census Business Builder: Regional Analyst Edition - 2.6:

From the State Data Center (SDC) Program:

From Foreign Trade > U.S. International Trade Data:

Note: After you create an account, select options for State Export Data (Origin of Movement) or State Import Data (State of Destination) by HS or NAICS. Select State (Alabama) and Measures, Commodity, Country and/or Time for data. For more information, see Quick Start Guide.

Sources: 2014 Population and Housing Unit Estimates and 2014 American Community Survey, 1-Year Estimates.

Sources: 2009-2013 American Community Survey, 5-Year Estimates, 2012 Survey of Business Owners and Self-Employed Persons (SBO) and other federal data.

Source: 2012 Economic Census. The U.S. Census Bureau will release 2017 Economic Census statistics from September 2019 through 2021.