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ACS Changelog

June 17th, 2025

All notable changes to this project will be documented in this file.

If you have questions, please contact us by emailing our engineering team at [email protected].

June 2025

1.13.1 (June 25)

Added

  • Introduced the 2025.3 dataset.

Changed

  • Updated the default datarun from 2025.2 to 2025.3.

June 2025

1.13.0 (June 10)

Added

  • Default datarun set to 2025.2.

June 2025

1.12.1 (June 3)

Added

  • Introduced the 2025.2 dataset.

Removed

  • Removed the 2024.3 dataset.

March 2025

1.12.0 (March 11)

Changed

  • Updated the default datarun from 2024.3 to 2025.1.

February 2025

1.11.1 (February 6)

Changed

  • Updated the dataruns field in the /meta response to include 2025.1.

Added

  • Introduced the 2025.1 dataset.

October 2024

1.11.0 (October 18)

Added

  • Added support for the datarun query parameter to switch between dataruns.
  • Added the dataruns field in the /meta response, listing available dataruns.
  • Introduced the 2024.4 dataset.

Changed

  • Updated the dataruns field in the /meta response to include 2024.4.
  • Default datarun set to 2024.3.

July 2024

1.10.0 (July 3)

Changed

  • Data updated, using 2024.3 areas.

Added

  • cdp level data was added.

April 2024

1.9.12 (April 29)

Changed

  • Data updated, using 2024.2 areas.

February 2024

1.9.11 (February 12)

Changed

  • Data updated, using 2024.1 areas.

November 2023

1.9.10 (November 20)

Changed

  • Data updated, using 2023.4 areas.

July 2023

1.9.9 (July 26)

Changed

  • Data updated, using 2023.3 areas.

May 2023

1.9.8 (May 9)

Changed

  • Data updated, using 2023.2 areas.

March 2023

1.9.7 (March 24)

Refactored

  • Updated back-end infrastructure.

January 2023

1.9.6 (January 24)

Changed

  • Data updated, using 2023.1 areas.

November 2022

1.9.5 (November 14)

Changed

  • Data updated, using 2022.4 areas.

August 2022

1.9.4 (August 10)

Changed

  • Data updated, using 2022.3 areas.

April 2022

1.9.3 (April 26)

Changed

  • Data updated, using 2022.2 areas.

January 2022

1.9.2 (January 24)

Changed

  • Data updated, using 2022.1 areas.

April 2021

1.9.1 (April 13)

Fixed

  • Converted ACS no data estimates to null.

March 2021

1.9.0 (March 15)

Added

  • 10 new metrics (see /meta/metrics for more detail):
    • adult_civilian_population
    • carpooling
    • civilian_noninstitutionalized_population
    • cohabiting_couple_households
    • cohabiting_couple_households_pct
    • commute_other_means
    • driving_alone
    • public_transport
    • walking
    • workers_16_and_over

Changed

  • Updated Census data version to 2019.

Fixed

  • Derived percentage metrics now correctly represent national percentages as reported by ACS. Derived metrics only occur when an Emsi Area is not represented in the latest version of ACS.

Removed

  • 4 removed metrics:
    • families
    • families_pct
    • non_family_households
    • non_family_households_pct

December 2020

1.8.0 (December 4)

Added

  • zip level data was added.
  • tract level data was added.

Changed

  • The ACS data now uses Emsi geographies.

September 2020

1.7.0 (September 25)

Added

  • 10 new metrics (see /meta/metrics for more detail):
    • carpooling_pct
    • commute_other_means_pct
    • driving_alone_pct
    • employed_with_health_insurance
    • median_house_value
    • median_monthly_rent
    • non_english_households_pop
    • population
    • public_transport_pct
    • walking_pct

Refactored

  • Restructured back-end data structures to improve API resource allocation and performance.

June 2020

1.6.0 (June 15)

Fixed

  • The following ACS estimate values are now returned as null:
    • -888888888 – estimate is not applicable or not available
    • -999999999 – the number of sample cases is too small

January 2020

1.5.0 (January 30)

Changed

  • Updated Census data version to 2018.

Fixed

  • Replaced fips with county in API documentation as fips is not a valid level.

March 2019

1.4.2 (March 20)

Changed

  • Upgraded proxy web server.

1.4.1 (March 4)

Changed

  • Minor performance improvements.

February 2019

1.4.0 (February 26)

Changed

  • ACS estimate values of -666666666, denoting insufficient sample observations for a given region, are now returned as null.

1.3.0 (February 14)

Changed

  • Clarified wording in API documentation.
  • Changed the nonfamily_households and nonfamily_households_pct metrics to non_family_households and non_family_households_pct respectively.
  • Updated titles/descriptions for the following metrics: foreign_born_population, foreign_born_population_pct, disabled_population, households, non_family_households, and non_family_households_pct.

1.2.0 (February 12)

Changed

  • median_household_income and per_capita_income metric now use the new money format.
  • Updated descriptions for vacant_housing_units, homeowner_vacancy_rate, and rental_vacancy_rate.
  • Updated homeowner_vacancy_rate and rental_vacancy_rate to use the percent format.
  • Changed metric name of veteran_status to veterans.
  • All metric titles are now in title case (the capitalization of the first letter of each word).
  • Updated attribution title and body to include "American Community Survey" instead of just "ACS".

Added

  • New money metric format.
  • New veterans_pct, foreign_born_population_pct, and disabled_population_pct metrics.

Fixed

  • Updated veterans, foreign_born_population, and disabled_population to use the correct ACS variables.
  • Corrected nonfamily_households and nonfamily_households_pct metrics, they no longer overwrite one another.

1.1.0 (February 5)

Changed

  • In the /meta/metrics and /meta/metrics/{metric} endpoints the following field names changed to be more accurate to what they represent:
    • acs_census_tables changed to acs_census_variables
    • acs_census_table_links changed to acs_census_variable_links

Added

  • 31 new metrics (see /meta/metrics for more detail):
    • median_age
    • per_capita_income
    • poverty_level_pct
    • children_poverty_level_pct
    • seniors_poverty_level_pct
    • mean_commute_time
    • remote_workers
    • remote_workers_pct
    • housing_units
    • occupied_housing_units
    • occupied_housing_units_pct
    • vacant_housing_units
    • vacant_housing_units_pct
    • homeowner_vacancy_rate
    • rental_vacancy_rate
    • veteran_status
    • foreign_born_population
    • disabled_population
    • avg_household_size
    • households
    • families
    • families_pct
    • avg_family_size
    • married_family_households
    • married_family_households_pct
    • male_householder_family_households
    • male_householder_family_households_pct
    • female_householder_family_households
    • female_householder_family_households_pct
    • nonfamily_households
    • nonfamily_households

January 2019

1.0.0 (January 28)

Added

  • Start a changelog to document updates to the API.