California Hard-to-Count Index Interactive Map

The interactive map shows California census tracts and block groups shaded by the California Hard-to-Count Index

  • Pan the map to examine a community.
  • Click on a tract to learn about an area.
  • Zoom in to see block group-level data.

Click on the map to get started!

Data download: Click either of the links to download files of the latest version of the California Hard-to-Count Index at the tract and block group levels.

HTC Map image

California Hard-to-Count Index

Many California residents live in areas that, based on demographic, socioeconomic and housing characteristics, may be hard to count in 2020. This interactive map shows California census tracts and block groups shaded by their California Hard-to-Count Index, a metric that incorporates 14 variables correlated with an area being difficult to enumerate. Census tracts and block groups with higher CA-HTC indexes likely will pose significant challenges to enumerate in 2020, while tracts and block groups with lower indexes should be easier to count.

Using the Map

California has 8,057 census tracts and each tract has up to nine block groups.

Clicking on a tract or block group shows a pop-up box that includes information about hard-to-count variables in the area, such as the percentage of housing units that are vacant and the percentage of limited-English speaking households. 

The widgets in the map’s upper-left corner provide more ways to explore the map. Use the search bar to search by county or address. Select a city in the bookmark widget to zoom to specific parts of the state.

Choose a different basemap. Use the draw widget to denote an area of focus, or upload date in .shp or other file format. Print the desired map with the print widget.

Identify census tracts with hard-to-count indexes above a certain value using the filter tool in the upper-right corner. The “Layer” list allows layers to be turned on or off. And the “Legend” button shows the ranges of CA-HTC Index classes.

More data is available by clicking on the three dots in the popup box’s bottom-right corner, which brings up the data attribute table.

Or go to the attribute table directly by clicking on the arrow at the center-bottom of the map. Tracts or block groups can be filtered based on certain characteristics and the results exported in an Excel-friendly format.

Sources: CA HTC Index variables, 2013-2017 American Community Survey 5-year estimates; California Public Utilities Commission; 2018 Planning Database