Iowa

Johnson

152,854
2020 population
1840
first census record
19
census records

About Johnson

Johnson, Iowa, first appears in the United States federal census in 1840, when it recorded a population of 1,491. At the most recent census, in 2020, its population stood at 152,854.

The county's recorded population has risen across the decades to its highest level in 2020.

On the ground today, 96 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020152,854
2010130,882
2000111,006
199096,119
198081,717
197072,127
196053,663
195045,756
194033,191
193030,276
192026,462
191025,914
190024,817
189023,082
188025,429
187024,898
186017,573
18504,472
18401,491
Source

Population data from the United States decennial census, U.S. Census Bureau (public domain).

Historic places in Johnson

National Register of Historic Places listings in Johnson, Iowa.

First Johnson County Asylum
Iowa City
Roberts Octagon Barn
Sharon Center
Iowa City Downtown Historic District
Iowa City
Stone Academy
Solon
Cavanaugh-Zetek House
Iowa City
Ranshaw, Samuel and Emma A., House
North Liberty
Old Capitol
Iowa City
Oxford Commercial Historic District
Oxford
State Quarry, Old
North Liberty
Johnson, Sylvanus, House
Iowa City
Coralville Public School
Coralville
Johnson County Savings Bank
Iowa City
Close House
Iowa City
Schindhelm-Drews House
Iowa City
Sutliff Bridge
Iowa City
College Block Building
Iowa City
Kirkwood House
Iowa City
South Summit Street District
Iowa City
Gilbert-Linn Street Historic District
Iowa City
Wentz, Jacob, House
Iowa City
Cottage at Rock and Dubuque Streets
Solon
Saints Peter and Paul Catholic Church
Solon
Rittenmeyer, F. X., House
Iowa City
Wehner, Roland and Marilyn, House
Iowa City
Browse all Iowahistoric sites ›

Other counties in Iowa

Explore census history and historic records for more Iowa counties.

PolkPottawattamiePoweshiekRinggoldSacScottShelbySiouxStoryTamaTaylorUnionVan BurenWapelloWarrenWashingtonWayneWebsterWinnebagoWinneshiek
Unlimited access

Everything a full report reveals about Johnson County, Iowa

This page charts the census history of Johnson County, Iowa. A full Aubrey report for an address here pulls together everything the historical record holds about the ground, from the earliest settlement to the twentieth century:

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.
First month just $5.99, then $11.99 a month. Unlimited locations, cancel anytime.

Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.

Start your Johnson County, Iowa report
Or see a real report first

Explore Iowa records

Iowahistory ›NRHP historic sites ›Notable people from Iowa›

Frequently asked about Johnson

When does Johnson first appear in the US census?
Johnson, Iowa first appears in the federal census in 1840, with a recorded population of 1,491.
What is the population of Johnson?
At the most recent federal census (2020), Johnson had a recorded population of 152,854.
How many historic places are in Johnson?
96 sites are listed on the National Register of Historic Places in Johnson, Iowa.
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.

Research your locationView a free sample report