Mapping the Average House Age by County

Last year I moved into a city which had much older housing stock than other cities that I had lived in before. I was under-prepared for the housing market here, because I had not researched the factors that you should look into for older homes which vary a lot depending on the era that they were built in.  I created this interactive mobile friendly map to visually help show the differences in regions and counties.

Tips: There are plus [+] and minus [-] buttons to zoom in or out of the map.  You can also drag to move around the map. If you click or hover over a county, a tool tip will appear with that county’s break down of housing age. If you’re on mobile, pinch to zoom works as well.

Housing Stock Age Map

Older Housing
Newer Housing

Average Home Built in
Average Home Age

Homes Built by Decade
Built 2010 or Later
Built 2000 thru 2009
Built 1990 thru 1999
Built 1980 thru 1989
Built 1970 thru 1979
Built 1960 thru 1969
Built 1950 thru 1959
Built 1940 thru 1949
Built 1939 and Earlier

Counties with the oldest housing

CountyAvg Build DateAge (Years)
Webster County, Nebraska192691
Suffolk County, Massachusetts192888
Franklin County, Nebraska192987
Greeley County, Nebraska193285
Jewell County, Kansas193285
Richardson County, Nebraska193383
Stark County, Illinois193483
Keokuk County, Iowa193582
Pawnee County, Nebraska193681
St. Louis city, Missouri193680

Counties with the Newest Housing

CountyAvg Build DateAge (Years)
Sumter County, Florida199719
Collin County, Texas199720
Rockwall County, Texas199720
Forsyth County, Georgia199621
Williamson County, Texas199521
Flagler County, Florida199522
Henry County, Georgia199422
Hancock County, Mississippi199423
Kendall County, Illinois199423
Long County, Georgia199324


Interesting things I saw

  • The gold areas (older homes) of the Midwest and Northeast are in the Rust Belt, which makes sense.
  • The South-East, Texas, and Western states have seen a lot of new housing go up in the last few decades.
  • The large gold areas in the Great Plains correspond to the depopulation of the rural areas in the Great Plains because of urbanization, the Dust bowl, and the Great Depression.  I had to look it up, because I thought I had made an error.

Post a comment if you found something else from the map!

Notes: the original data is from the 2014 5 Year Data Profile American Community Survey by the US Census. The Average Home Built-in metric was calculated using the data from the ACS and slightly interpolated especially for the 1939 and earlier bucket of data, because it represents such a large period of time. Also I have to give a big thanks to Nathan Yau of Flowing Data for his great tutorials.

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