Which counties have growth momentum with almost no competition?

Q: Which counties have growth momentum with almost no competition?

WITHDRAWN August 24, 2026 — audit record only, not current analytics. This ranking came from a 44-county extract that could not be reproduced from any CMS file. The county explorer carries April 2026 health plan share, momentum and market size instead. In a two-carrier county with rising penetration, demand is growing faster than the shelf. A new entrant is not fighting for share, it is absorbing demand the incumbents cannot brand-block, and brokers in these counties have almost nothing to sell. The same table works defensively: if you are one of the two incumbents, these are the counties where a rival filing should trigger a retention plan.

Archived — withdrawn by the 2026-08-24 audit

WITHDRAWN — NOT CURRENT ANALYTICS. It ranked counties by the number of MA carriers present, and this site has no county-level carrier source. This page is kept as an audit record. Nothing on it should be cited, exported or used to plan against. View the methodology archive · Open the current alternative: the County Explorer

This page previously ranked counties by carrier count and penetration velocity. Those figures came from a 76-county extract that the 2026-08-24 audit found was not reproducible from any CMS file, and they have been removed rather than restated.

The whitespace list

This chart has been withdrawn. It ranked counties by carrier count, and this site has no county-level carrier source — the figures came from a 76-county extract that a 2026-08-24 audit found was not reproducible from any CMS file (every county in it also carried an identical +0.87 pt velocity, which observed data does not do). Restoring it needs the CMS CPSC ingest. Until then, rank markets by headroom and momentum in the county explorer or with the Market Opportunity Score. Read the audit.

These figures have been withdrawn. This county whitespace ranking was built from a 76-county extract that a 2026-08-24 audit found was not reproducible from any CMS file — denominators were wrong by up to 995×, one county carried the wrong FIPS code, and the year-by-year history was smooth in a way observed data is not. Rather than restate numbers we cannot source, they have been removed. Rank markets with the county explorer or the Market Opportunity Score, both of which run on the April 2026 CMS county file. Read the audit.

Coverage: what this list can and cannot see

These counties come from the 76-county tracked set compiled from CPSC files, chosen for signal value, not randomness — and withdrawn on August 24, 2026. Penetration and momentum for every one of the 3,199 counties are in the county explorer; what is still missing here is carrier-level detail, which needs the CPSC ingest (see the roadmap card on the sales hub). Treat the carrier columns as history, not as a census of American MA whitespace.

Where to go instead

The County ExplorerCurrent analytics on the April 2026 CMS records Market Opportunity ScoreAttractiveness ranking for all 3,199 counties Read the auditWhy this dataset was withdrawn

What should I do next?

Score the opportunity3,199 counties ranked on headroom and momentum Build the AEP target listWhere to point the field Open my workspaceSaved markets, analyses and alerts Work the county listFilter and rank all 3,199 counties

ⓘ Read the audit → Open the current alternative ☰ View the methodology archive

Why this analysis was withdrawn

It ranked counties by the number of MA carriers present, and this site has no county-level carrier source. This page previously ranked counties by carrier count and penetration velocity. Those figures came from a 76-county extract that the 2026-08-24 audit found was not reproducible from any CMS file, and they have been removed rather than restated.

What failed QA: every county in the extract carried an identical +0.87 pt velocity, which observed data does not do, and the carrier counts could not be tied to any named CMS file.
What is required to restore it: the CMS Monthly Enrollment by Contract/Plan/State/County (CPSC) ingest, which is the only authoritative county-level carrier source. It is PLANNED, not built.
Current safe substitute: the County Explorer, on the April 2026 CMS county records that every live surface uses.

Provenance — County-level MA market snapshot (76-county curated extract, withdrawn)

Source file: Monthly MA Enrollment by State/County/Contract (CPSC family), from CMS Medicare Advantage/Part D Contract and Enrollment Data
Vintage: WITHDRAWN — historical only, not used in current production analytics. See the archive.
Last updated: May 1, 2026
Refresh cadence: Monthly (pipeline pending; currently a curated extract)
Method: Penetration, D-SNP share, carrier count and top carrier per county compiled from CPSC files for 76 high-signal counties.
Known limitations: Covered 76 counties, not all 3,199. Withdrawn on August 24, 2026: it could not be reproduced from any CMS file. Penetration for every county now comes from the April 2026 CMS county file.