Head-to-head, from CMS Plan Year 2026 data.
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South Dakota is the cheaper of the two: a 40-year-old pays about $725/month for the median Silver plan, versus $731 — a difference of $6/month (1%) before subsidies.
| South Dakota | Oklahoma | |
|---|---|---|
| Median Silver @40 | $725 | $731 |
| Cheapest Silver @40 | $512 | $561 |
| Most expensive county @40 | $882 | $1,300 |
| Age 27 | $420 | $460 |
| Age 60 | $1,087 | $1,192 |
| Carriers | 3 | 7 |
| Counties | 66 | 77 |
| 1-carrier counties | 0 | 5 |
| Plan types | EPO, HMO, PPO | HMO, PPO |
Source: CMS Plan Year 2026 Qualified Health Plan Landscape. Full-price filed rates before premium tax credits; not a quote or an offer of coverage.
This page sets two states against each other. For county-by-county carriers, plan data and help actually enrolling, I publish a page for each state on Coverage by County: South Dakota or Oklahoma. There is also a blog covering deductibles, subsidies and special enrollment periods.
Put your ZIP code in and I will show you the carriers filing in your county, what the cheapest plan costs, and what you would actually pay after any help you qualify for. No cost, and you talk to me — not a call center.
Moving permanently from South Dakota to Oklahoma is a qualifying life event, so you get a 60-day special enrollment window counted from the move date — time enough to work through the 7 carriers filing in Oklahoma without waiting for open enrollment. Two conditions trip people up: you generally need to have held qualifying coverage for at least one day in the 60 days before the move, and relocating purely for treatment or a holiday will not qualify.
Nothing transfers. You close the South Dakota plan and enroll fresh against Oklahoma’s 77 counties, which means a new network and a new price regardless of which insurer you land on.
The carrier lists do not intersect — 3 in South Dakota, 7 in Oklahoma, none shared. Expect to start a relationship with a new insurer, likely one of Ambetter of Oklahoma and Blue Cross and Blue Shield of Oklahoma.
Both sides keep the option open: PPOs are sold in every county — 66 in South Dakota, 77 in Oklahoma. That is the type most likely to cover care outside its network, and it is the one to prioritise if you will genuinely be in both rather than simply leaving.
You cannot carry one plan in South Dakota and a second in Oklahoma. Eligibility follows primary residence, the address on your return, and everything received in the other state is normally out of network.
State averages hide enormous county-level spread. Whichever of South Dakota or Oklahoma you are in, your ZIP is what sets your premium.