1. covidcast::county_census
    County census population data
    csv| xlsx| json| ndjson| rda| rds
    data.frame|3289 x 9
  2. covidcast::msa_census
    Metro area population data
    csv| xlsx| json| ndjson| rda| rds
    data.frame|2797 x 7
  3. covidcast::state_census
    State population data
    csv| xlsx| json| ndjson| rda| rds
    data.frame|57 x 9