Real Estate Price Change in the US

This timeline is an animated map that shows the development of home values throughout the US. Play the button to see the changes from 1996 to 2020. Hover over the counties to get detailed information from each county. For more information scroll down.
Map of Real Estate price change
Price Change


This is an animated Choropleth map of Real Estate property values in the US. It shows how the values of real estate properties and how they change between 1996 and 2020. For 2020 only the first three months have been included. As the data becomes available I will add more months.

To get the values, I looked for an approximation to home value and I decided to use Zhvi. Fortunately, Zillow had data since 1996 to this year. To show how the values progressed, I calculated the median of each county. Then I calculated the percentage change with each year, from 1996 to 2020. Fucsia shows decreasing values and green shows increasing values compared to the median. During the first 10 years many counties have a -1% change. This is because there is no available Zhvi data for them for that year, but there is, in later years. I decided to include those first years because it is still interesting to see how other counties faired in that same timeline. Nevertheless, until today out of 3,007 counties, 64 parishes, 19 organized boroughs, the data only includes 2844 counties, parishes and boroughs.

The animation makes it possible to see the 2008 housing bubble. You can clearly see the rapid change in colors. To make this even more clear and less distracting, I decided to give a 0% change color to the counties that had no data. So counties with undefined% or 0% do not distract the viewer of the changes and trend. To know exactly which counties have missing values, you just have to hover over them. The data updates with the animation.

Made by Luz K. Molina with D3.js.

Resources and Inspiration

I have always been interested in Real Estate prices and investment. I am not buying and selling property at the moment, but I definitely like to look at data related to it. My husband, Kevin C. Dunn, recently started working for Keller Williams, as a Realtor in the Fort Walton Beach Area. Since we talk about how home prices around the US increase and where this happens, I decided to make a map to see how they actually progress.

The counties shapefile, to create this map, was downloaded from the US Census Bureau. The code to make an animated choropleth map, was altered from rfdonohue's block.

For this visualization I used the Zillow Home Value Index (ZHVI): "a smoothed, seasonally adjusted measure of the typical home value and market changes across a given region and housing type". They were downloaded from Zillow Research.

For more visualizations on Real Estate check this map on property prices and how it relates with Educational Attainment in the US.

Map of Real Estate price change Animation of of Real Estate price changes