Lamar County is one of Mississippi's fastest-growing counties, driven by suburban expansion from Hattiesburg. With a population of approximately 65,000, the county has grown steadily over the past two decades as families and businesses have moved to Oak Grove, Sumrall, and the unincorporated areas south and west of Hattiesburg. Purvis is the county seat, though Oak Grove — a large unincorporated community — is the primary population center.
While Lamar County does not have its own major hospital, it benefits from immediate adjacency to Forrest County and the Hattiesburg medical market. Forrest General Hospital, a 512-bed regional medical center, is the primary facility for most Lamar County residents and is within a 15-20 minute drive of most communities in the county. This proximity gives Lamar County residents stronger healthcare access than many Mississippi counties of similar size.
For residents earning above 100% FPL, the ACA marketplace provides meaningful subsidies. At 100-150% FPL, Enhanced Silver plans with Cost-Sharing Reductions deliver coverage that approaches Medicaid-level benefits at minimal cost. Lamar County's growing population includes many young families and workers in small businesses that do not offer employer coverage — the marketplace is designed for exactly this demographic.
BCBS of Mississippi is the anchor carrier in the Hattiesburg area and most likely to include Forrest General Hospital and the full range of Hattiesburg-area specialists. Before enrolling in an Ambetter plan, confirm that Forrest General and your primary care provider participate in Ambetter's network — carrier networks differ, and a plan that excludes the region's primary hospital is a poor fit for most Lamar County families.
| Annual Income (Single Adult) | % of FPL (2026) | Subsidy Status | Est. Net Monthly Cost (Silver) |
|---|---|---|---|
| Below $15,960 | Below 100% | Mississippi coverage gap — no subsidy | Full premium (no assistance) |
| $15,960 – $23,940 | 100–150% | Maximum subsidy + Enhanced Silver CSRs | $0 – $28/month |
| $23,941 – $31,920 | 150–200% | Strong subsidy + Silver CSRs | $28 – $80/month |
| $31,921 – $47,880 | 200–300% | Meaningful subsidy | $80 – $185/month |
| $47,881 – $63,840 | 300–400% | Moderate subsidy | $185 – $310/month |
Estimates for a single 40-year-old on a benchmark Silver plan. Actual costs depend on household size, age, and plan selection. Family of four FPL threshold: $33,240 for 100%. The 8.5% income cap applies under current ARP extensions.
Forrest General Hospital in Hattiesburg is the primary regional medical center for Lamar County and surrounding counties. It is a 512-bed facility providing comprehensive services including a Level II trauma center, cardiac catheterization and surgery, oncology, neonatal intensive care, orthopedics, and neuroscience. The hospital is affiliated with the University of Southern Mississippi's health programs and serves as the region's referral center for complex cases.
The University of Southern Mississippi, headquartered in Hattiesburg with facilities extending into Lamar County, also contributes to the healthcare landscape. USM students and employees may have access to campus health services, but those without qualifying employer coverage can use the ACA marketplace for comprehensive health insurance.
Lamar County's growth is driven largely by families seeking affordable housing within commuting distance of Hattiesburg's employment, schools, and medical infrastructure. For young families, the ACA marketplace's Essential Health Benefits are particularly relevant — all marketplace plans must cover maternity and newborn care, pediatric services, and preventive care at no additional cost. Having a baby is also a qualifying life event that triggers a 60-day Special Enrollment Period to add the newborn to an existing plan or enroll in a new one.
For families earning in the 100-250% FPL range (up to approximately $67,650 for a family of four in 2026), Enhanced Silver plans offer the strongest value. These plans have lower deductibles, lower copays, and lower out-of-pocket maximums than standard Silver plans — and the cost difference is entirely subsidized. A family at 150% FPL can access coverage with a $300-$500 deductible rather than the standard $3,000-$6,000 range.
Oak Grove is the largest community and the primary suburban growth center. Purvis is the county seat. Sumrall and Lumberton are smaller communities in the western and southern parts of the county. All Lamar County residents share the same ACA marketplace pool and carrier options.
Lamar County residents enroll through HealthCare.gov using their Mississippi zip code. Open enrollment for 2026-2027 runs November 1, 2026 through January 15, 2027. Enroll by December 15 for January 1 coverage. Special enrollment periods are available for qualifying life events including job loss, moving, marriage, birth of a child, or loss of other qualifying coverage.
Ready to compare Lamar County health insurance plans? A licensed agent can walk you through carriers, costs, Forrest General network coverage, and subsidy eligibility — at no cost to you.
Get a Free QuoteAlso see: Mississippi Health Insurance guide · Pearl River County, MS