Free Research Collection
US County Histories
Explore the history of every US county. Each page traces two centuries of decennial census population data, the military engagements fought on the county's soil, and the places within it listed on the National Register of Historic Places, all free to browse and linked to the wider record.
3,432
counties
51
states
1790-2020
census coverage
Browse by State
Alabama
AL
67
Alaska
AK
73
Arizona
AZ
16
Arkansas
AR
75
California
CA
59
Colorado
CO
65
Connecticut
CT
8
Delaware
DE
10
District of Columbia
DC
1
Florida
FL
67
Georgia
GA
161
Hawaii
HI
11
Idaho
ID
46
Illinois
IL
103
Indiana
IN
92
Iowa
IA
99
Kansas
KS
112
Kentucky
KY
120
Louisiana
LA
66
Maine
ME
16
Maryland
MD
24
Massachusetts
MA
14
Michigan
MI
85
Minnesota
MN
93
Mississippi
MS
82
Missouri
MO
116
Montana
MT
57
Nebraska
NE
101
Nevada
NV
21
New Hampshire
NH
10
New Jersey
NJ
21
New Mexico
NM
35
New York
NY
62
North Carolina
NC
101
North Dakota
ND
61
Ohio
OH
88
Oklahoma
OK
103
Oregon
OR
37
Pennsylvania
PA
67
Rhode Island
RI
5
South Carolina
SC
47
South Dakota
SD
90
Tennessee
TN
96
Texas
TX
257
Utah
UT
32
Vermont
VT
14
Virginia
VA
178
Washington
WA
39
West Virginia
WV
55
Wisconsin
WI
72
Wyoming
WY
24
About the county histories
What do Aubrey's county history pages include?
Each county page traces its population across the decennial US census from 1790 to the present, lists the documented military engagements fought within the county, and shows the places inside it that are listed on the National Register of Historic Places, with links to the wider historical record.
How many US counties are covered?
Aubrey holds census population histories for 3,432 counties across 51 states.
How far back does the population data go?
The decennial federal census began in 1790 and has been taken every ten years since, so a long-established county can have more than two centuries of recorded population figures.
Is this free to use?
Yes. The county histories are a free research collection. For a full history of any specific address, including the records nearest to it, you can run an Aubrey report.
Aubrey Research
Research the history of any US location
Aubrey searches federal archives, archaeological records, historic registers, and primary sources to build a full historical report for any address or place in the United States.
Unlimited access
Everything a full the United States report reveals
Pick any location and Aubrey pulls together 18 strands of its history, each drawn from the record:
Overview
An interactive map of the location with historic sites, battles and Native heritage plotted, and its full story era by era.
The Land
The historic sites and place names around the location, and how this land was settled and used.
Geology
The bedrock beneath the site, its age and rock type, reaching back millions of years.
LiDAR Terrain
Laser-scanned terrain that reveals earthworks and old features hidden in the landscape.
Conflict & War
The battles, raids and skirmishes fought near here, across every era of American conflict.
The Civil War
The Civil War on this ground, 1861 to 1865: who held it, and the battles, camps and regiments nearby.
The Soldiers
The men who marched from here in the Civil War, named and traced where the record allows.
Native Heritage
The Native nations who held this land, mapped across time from before European contact to today.
Settlement
Who claimed and held this ground, from Indigenous homelands through the colonial powers to the United States.
The Community
How the town grew, who came, and what kind of place it became, traced through the census record.
Rivers & Rail
The rivers, canals and railroads that connected this place between 1830 and 1911.
Notable People
The people born, buried or genuinely tied to this exact place, with their stories.
Historical Maps
Historic maps of the location layered over how it looks today.
Finds & Access
Museum objects tied to the area, and the laws on searching, collecting and access here.
Literature
The old books, county histories and archives that mention this place, quoted with their sources.
Spotlight
A deep dive into the most remarkable, lesser-known history of the place, traced back to the record.
Points of Interest
The most significant historic sites and landmarks near the location, and why they matter.
Timeline
The whole story of the location told era by era, from first peoples to the present day.
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Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.