Key takeaways
- A business address shared by thousands of companies is almost always a registered agent's office, not the companies' own premises. Every US entity must name a registered agent with a physical in-state address to accept legal mail.
- The most crowded address in the country is 1209 North Orange Street in Wilmington, Delaware, the office of CT Corporation, on file for at least 1.19 million companies. 251 Little Falls Drive (CSC) is second at about 1.16 million.
- Concentration is heavy: the 100 busiest buildings are the registered address for 6.5 million companies, and 119 single buildings each serve 10,000 or more. Seven of the ten busiest are in Delaware.
- A shared address is not itself a red flag. It matters only when it is the sole identifying detail on an entity with no officers, no separate business address, and a recent formation.
The address belongs to a registered agent, not an office. Every US business must name a registered agent with a physical, in-state address to accept legal mail, and commercial agents list tens of thousands of companies at a single address. The most crowded, 1209 North Orange Street in Wilmington, Delaware, is on file for at least 1.19 million companies.
Why do so many companies share one address?
A registered agent is the person or company an entity names to receive service of process and official state mail. Every state requires one, and the agent must have a real street address in the state, not a PO box. That address goes on the public filing.
Most small companies name themselves or their owner. But any company that operates in more than one state, or that forms in Delaware, Wyoming, or Nevada without a physical presence there, hires a commercial registered agent to hold the address for it. A handful of national agents do this at scale, so their office address ends up on the filings of hundreds of thousands of unrelated companies. The address is shared; the companies are not otherwise connected.
This is ordinary infrastructure. A Delaware LLC run from California has no Delaware office, so it pays an agent in Wilmington to be its legal address. The same logic drives the numbers below.
Which US addresses have the most companies?
Counting the registered-agent address on every current filing across the 50 state registries, a small number of buildings dominate. The eight most crowded, below, are each on file for more than 100,000 companies; the ten busiest together account for 3.7 million.
| Building | Registered agent | Companies on file (at least) |
|---|---|---|
| 1209 North Orange Street, Wilmington, DE | CT Corporation (Wolters Kluwer) | 1,189,229 |
| 251 Little Falls Drive, Wilmington, DE | Corporation Service Company (CSC) | 1,159,199 |
| 131 Continental Drive, Newark, DE | United States Corporation Agents / LegalInc | 240,537 |
| 8 The Green, Dover, DE | A Registered Agent, Inc. / others | 210,504 |
| 5900 Balcones Drive, Austin, TX | Registered Agents Inc / Northwest Registered Agent | 189,800 |
| 16192 Coastal Highway, Lewes, DE | Harvard Business Services | 183,872 |
| 850 New Burton Road, Dover, DE | Cogency Global / others | 155,020 |
| 108 West 13th Street, Wilmington, DE | Business Filings Incorporated / VCorp Services | 148,785 |
The figures count distinct entities whose registered-agent address, after normalizing suites and spelling, resolves to the building, as of July 2026. Registered-agent address is not recorded on every filing, so each count is a floor: the real number is higher, not lower.
The best-known of these is 1209 North Orange Street. When the New York Times profiled it in 2012, it was the listed address of about 285,000 businesses. That figure has been repeated for more than a decade. The current count is more than four times larger. The building is the Delaware office of CT Corporation, the oldest of the national agents, which our data shows under its filing name The Corporation Trust Company. Ranked by agent firm rather than by address, CT Corporation and CSC are the two largest registered agents in the country.
Concentration runs deeper than the top of the list. The 100 busiest buildings are the registered address for 6.5 million companies, about one in every eleven filings that records an agent address, and 119 individual buildings each serve 10,000 or more entities. No single state registry shows this, because each one holds only its own filings; the pattern appears only when you read all 50 registries together.
Why are the busiest addresses in Delaware?
Seven of the ten most crowded buildings are in Delaware, most of them in Wilmington and Dover. Delaware is the default state of formation for companies with outside investors: its Court of Chancery hears business disputes without a jury and has a century of case law behind it, which is why a company incorporated anywhere can be a Delaware entity on paper. None of those companies has a Delaware office, so all of them need a Delaware agent, and the agents cluster their address into a few buildings near the state capital (Delaware Division of Corporations).
The non-Delaware entries, such as 5900 Balcones Drive in Austin, are the base of the newer discount agents like Registered Agents Inc and Northwest Registered Agent, which file in every state from a home office in Texas or Wyoming.
Is a shared address a red flag?
On its own, no. A registered-agent address shared by a million companies is the most normal thing in the corporate record. Treating it as suspicious would flag most of the Fortune 500, which incorporates in Delaware through exactly these agents.
What matters in due diligence is what else is on the filing. A shared agent address is worth a second look when it is the only concrete detail: the entity lists no officers or principals, has no business address distinct from the agent, and was formed very recently. Those signals together, not the shared address alone, are what separate a shell from an ordinary out-of-state company.
The agent address also tells you nothing about who owns the company. The registered agent is a mail contact, and most states do not publish the owners of an LLC at all. To learn who is behind an entity, you read its officer and principal fields, not its agent. This is informational, not legal advice; a formal check should rely on the primary filing and, where it matters, on counsel.
How to pull the address behind a company
The registered address is a field on the public record, so you can read it programmatically instead of opening 50 different state websites. GovFiles normalizes the registered-agent, address, and officer fields from all 50 Secretary of State registries into one schema, refreshed monthly and delivered as a REST API or bulk Parquet. A single lookup returns the registered address and the agent:
curl -H "X-API-Key: $KEY" \
"https://api.govfiles.dev/v2/companies/us_de/3823145"
The response carries addresses.registered with street_address, locality, and region, alongside a parties array in which the registered agent appears as a role with kind set to registered_agent. To search the other way, POST the agent's name as q to /v2/officers/search with role set to registered_agent, for example {"q": "CT Corporation", "role": "registered_agent"}. It returns the matching filings a page at a time.
Frequently asked
Why are so many companies registered at the same address? Because the address belongs to a commercial registered agent, not to the companies. Every US business must list a registered agent with a physical in-state address to receive legal mail, and large agents such as CT Corporation and CSC each represent more than a million companies, all sharing one building.
What is the most common business address in the United States? 1209 North Orange Street in Wilmington, Delaware, the office of CT Corporation, is the registered address for at least 1.19 million companies as of July 2026. 251 Little Falls Drive in Wilmington, home to Corporation Service Company (CSC), is second at about 1.16 million.
Is it a red flag if a company shares an address with thousands of others? Usually not. A shared address almost always means a commercial registered agent, which nearly every out-of-state or Delaware company uses. It is worth a closer look only when the agent address is the only identifying detail: no officers on file, no separate business address, and a very recent formation date.
How do I find out who is actually behind a company at a shared address? Pull the full entity record, not just the agent. The registered agent is only the contact for legal mail. Check the officers or principals and any headquarters address on the filing; a real operating company usually lists a business address distinct from its agent.