Jumps straight to the locality this ZIP maps to.
CMS updates this file quarterly—January, April, July, and October—and occasionally re-posts a quarter mid-stream to fix errors. Each version we ingested is preserved below as a separate release.
CMS reorganizes its site often and direct file links break. If a download link below stops working, every release remains available from the official CMS ZIP-to-locality crosswalk page.
2026 Copy link
In effect October 1 – December 31, 2026 (Q4 2026 on this site).
In effect July 1 – September 30, 2026 (Q3 2026 on this site).
In effect April 1 – June 30, 2026 (Q2 2026 on this site).
In effect January 1 – March 31, 2026 (Q1 2026 on this site).
2025 Copy link
In effect July 1 – September 30, 2025 (Q3 2025 on this site).
In effect April 1 – June 30, 2025 (Q2 2025 on this site).
In effect January 1 – March 31, 2025 (Q1 2025 on this site).
2024 Copy link
In effect July 1 – September 30, 2024 (Q3 2024 on this site).
In effect April 1 – June 30, 2024 (Q2 2024 on this site).
In effect January 1 – March 31, 2024 (Q1 2024 on this site).
2023 Copy link
In effect October 1 – December 31, 2023 (Q4 2023 on this site).
2022 Copy link
In effect April 1 – June 30, 2022 (Q2 2022 on this site).
In effect January 1 – March 31, 2022 (Q1 2022 on this site).
2021 Copy link
In effect July 1 – September 30, 2021 (Q3 2021 on this site).
In effect April 1 – June 30, 2021 (Q2 2021 on this site).
In effect January 1 – March 31, 2021 (Q1 2021 on this site).
2020 Copy link
In effect July 1 – September 30, 2020 (Q3 2020 on this site).
In effect April 1 – June 30, 2020 (Q2 2020 on this site).
In effect January 1 – March 31, 2020 (Q1 2020 on this site).
2019 Copy link
In effect July 1 – September 30, 2019 (Q3 2019 on this site).
In effect April 1 – June 30, 2019 (Q2 2019 on this site).
In effect January 1 – March 31, 2019 (Q1 2019 on this site).
2018 Copy link
In effect July 1 – September 30, 2018 (Q3 2018 on this site).
In effect April 1 – June 30, 2018 (Q2 2018 on this site).
In effect January 1 – March 31, 2018 (Q1 2018 on this site).
Our methodology documents how every file is parsed, versioned, and verified.