USA VPN server in Saint Louis, and why the middle of the country

Culvert VPN's United States location is Saint Louis, Missouri, and it is a Premium city. It gives you an American exit address from a server near the geographic centre of the country, which keeps the round trip moderate from both coasts instead of very short from one and long from the other. The free tier does not include it; free servers are in Europe only.

Where the server is

Saint Louis sits on the Mississippi roughly halfway between the east and west coasts, and the long-haul fibre routes that cross the country pass through or near it on the way between Chicago, Dallas, Denver and the coasts. That makes it an unusual but sensible choice for a single US location: a server in New York would be 5 ms from Manhattan and 70 ms from California, while one in the middle is 30–50 ms from most of the country.

In the picker, the United States is a country row with Saint Louis beneath it. Tapping either does the same thing, since there is one city.

Latency from nearby regions

The United States is large, so the ranges are wider than for a European city. They come from distance, roughly a millisecond per 100 km each way plus routing overhead, and are what a phone on a good wired or Wi-Fi connection should see in the app:

On 4G add 20–40 ms of carrier delay. A round trip of 50 ms sounds like a lot next to a European figure, but for browsing and ordinary apps the difference between 15 and 50 ms is hard to notice; what you feel is bandwidth and packet loss, which is covered in ping versus speed. Where latency does show is in interactive uses, and there a central server is a fair compromise rather than a great one for anyone on a coast.

Who this location suits

People in the central and southern US, and visitors passing through. From the Midwest, the Plains and the South, Saint Louis is close enough to be a low-overhead default. Travellers and expats anywhere in the country who want a US exit address get one that is, at worst, moderately far away.

Anyone on shared Wi-Fi. Airports, hotel chains, conference centres, campus networks and coffee shops: the operator and everyone else on the router can see the destinations of your traffic, and some of these networks also filter ports or block common VPN protocols. A VPN to Saint Louis turns your traffic into one encrypted stream to a single US address, and the app tries several connection methods in order until one works.

Testing a service from the United States. A US exit address lets a developer or a shop owner see what an American visitor gets: which CDN edge answers, whether pricing and units come up in dollars, how a US-only feature flag behaves, and how long the site takes to load from a mid-continent address. It is also the location to use when a US customer reports something you cannot reproduce from elsewhere.

How the app measures it

The Saint Louis row in the picker shows a round trip measured from your phone when the picker opens, in milliseconds, plus a headroom figure for how much capacity the city has spare. Neither is a signal-bar glyph and neither is copied from a static table like the one above; the table is a guide to what is plausible, and the app's number is what is true right now.

Tap the United States and the app picks its quickest healthy city, then the healthiest server inside it. Individual servers are never shown, so a server being drained for maintenance or having its address rotated changes nothing you can see. Once connected, the exit IP on the screen is one the app verified through the tunnel by asking Culvert's own server what address it saw, rather than a third-party lookup.

Saint Louis is one of the Premium locations in Culvert VPN, billed through Google Play and shared across up to five devices; the app is on Google Play.