Geographic evidence lab

State comparison studio

Compare state concentration measures within one product and geographic framework. Selected jurisdictions retain their periods, sources, and interpretation limits.

Universe51Jurisdictions

Measures3Comparable signals

Selected4Shareable set

Comparable here

Every row is a 2024 state observation for the same ACA-regulated individual health insurance market, published through one KFF methodology.

Boundary still matters

These measures screen one insurance market. They do not rank state economies, employer coverage, consumer welfare, or legal liability.

Selection console

Choose two to four jurisdictions

Every selection retains the same individual-insurance market, KFF source, 2024 vintage, and metric definitions.

4 / 4

4 Census regions represented.

Selected

44 regions

High HHI

4At or above 2,500

Majority leaders

1Largest insurer at 50%+

Thin rivalry

3Three or fewer above 5%

Comparable state field

Market HHI across selected states

Bars share the 51-jurisdiction observed range. The benchmark marker is the published U.S. value.

Selected jurisdictionsHigher = more concentrated

Pressure lead: South Dakota at 3,396. U.S. benchmark: 3,650.

Active state dossier

North Carolina

Highly concentrated

South rank #11 on the higher-pressure ordering.

3,255National rank #29

U.S. benchmark

3,650-395 state delta

South avg

3,822-567 state delta

Benchmark matrix

Published measures and national deltas

Ranks follow pressure direction: higher HHI and leader share rank first, while fewer meaningful rivals rank first.

Jurisdiction	Region	Market HHI	Largest insurer share	Insurers above 5% share	Profile
North CarolinaNC / Highly concentrated	South	3,255#29 / -395 vs U.S.	43%#29 / -5% vs U.S.	3#11 / -1 vs U.S.	Open
New MexicoNM / Highly concentrated	West	3,222#30 / -428 vs U.S.	48%#25 / 0% vs U.S.	5#36 / +1 vs U.S.	Open
New JerseyNJ / Highly concentrated	Northeast	3,387#28 / -263 vs U.S.	50%#21 / +2% vs U.S.	3#11 / -1 vs U.S.	Open
South DakotaSD / Highly concentrated	Midwest	3,396#27 / -254 vs U.S.	40%#35 / -8% vs U.S.	3#11 / -1 vs U.S.	Open

Evidence contract

One market, one source, one vintage

Market: U.S. individual health insurance
Coverage: 51 jurisdictions / 2024
Publisher: KFF
Selected packet: NC / NM / NJ / SD

This geography layer describes the ACA-regulated individual health insurance market using KFF's 2024 state-level measures. It does not measure a state's overall economy, employer-sponsored insurance, or a legal market definition.