Comparison of the top registered agent services for South Dakota LLCs and corporations · Updated 2026-04-30
Picking the right South Dakota registered agent means trading off price against privacy, in-state expertise, and customer support quality. S.D. Codified Laws §47-34A-108 requires that the agent maintain a physical street address within South Dakota and accept service of process during regular business hours. Below, we rank the four registered agent services we evaluated for South Dakota-based LLCs and corporations in 2026.
Northwest Registered Agent
Physical-address-only operations; mail forwarding; same-day filing.
ZenBusiness
Pairs RA with LLC formation packages.
LegalZoom
Largest brand; phone-based support; bundled legal services.
Mid-tier pricing with full feature parity; suitable for businesses focused on cost-efficiency.
South Dakota-specific option: South Dakota Registered Agent.co operates exclusively in South Dakota and specializes in same-state filings. Best for businesses that want a state-focused provider with local-only operations.
| Filing | Cost | Renewal |
|---|---|---|
| LLC formation | $150 online / $165 paper | annually by the first day of the second month after formation anniversary |
| Annual Report | $50 | annually by the first day of the second month after formation anniversary |
| DBA / Fictitious Name | $10 | Every 5 years |
| Change of Registered Agent | $10 | — |
Source: South Dakota Secretary of State · Statute reference S.D. Codified Laws §47-34A-108
For most South Dakota LLCs, Northwest Registered Agent ranks first on privacy and Mainstay Filing offers the best value at $99/year. State-specific options like South Dakota Registered Agent.co specialize in same-state filings.
Commercial services range $50–$250 per year. Mainstay Filing is $99/yr; Northwest is $125/yr; ZenBusiness is $199/yr; LegalZoom is $249/yr.
Yes. File a Statement of Change of Registered Agent with the South Dakota Secretary of State for $10. Most commercial services handle the change paperwork for you.
National services like Mainstay Filing and Northwest operate across all 50 states with consistent pricing and online dashboards. State-specific providers (like South Dakota Registered Agent.co) focus exclusively on one state and often handle same-state-only filings faster.
Yes — under S.D. Codified Laws §47-34A-108, every South Dakota LLC must designate and maintain a registered agent with a physical street address in South Dakota.
RA Ratings independently reviews registered agent services. We may earn a commission from sponsored links; this does not affect rankings or editorial selection. Verify all filing fees with the South Dakota Secretary of State before submitting paperwork.