**Note** We estimate the total number of contacts across all clusters in a state and divide by the number on January 2, 2020, multiplied by a normalization factor of 1,000,000 to obtain the social contact index. **POI.csv** This file provides the size range for each POI type. A POI type may include subcategories with different radii. For example, ‘Automotive’ would include car dealers and car repair shops, which would have different radii. Therefore, we provide a range. This file has the following fields. - POI_Type is a string identifying the POI type. - POI_Subtype is a string identifying the POI subcategory. - Radius is the radius or radius range in meters. **Data** CSV files for each date are named in the format <Year><Month><date> in a folder named <State>, as illustrated in the following example. 20200102 in the folder named Florida is a file that contains data for Florida in January 2, 2020. (Date for a few dates are not available.) It contains the following fields. - ZCTA5 is a 5-digit Zip Code Tabulation Area code assigned by the US Census bureau, which corresponds to a geographic region that is a good approximation to the zip code. - POI_Type is a string describing the type of the POI, such as airport or grocery. - Number_of_Clusters is the number of clusters for that POI type in that zip code. - Cluster_Size_Mean is the average size of a cluster for that POI type in meters. - Cluster_Size_Variance is variance for the distribution of sizes of clusters for that POI type. - Avergage_Time is the average time spent by a person in a cluster at that POI type in minutes. - SCI is the Social Contact Index for that POI, as defined earlier. Updates: 1. The update on 27 Feb 2023 corrected for the use of incorrect times unit in the original data.