A bank in a town of 900 people is on your Cash App card — and your account there holds nothing
You looked at your card, or a statement line, or a direct deposit form, and found a name you have never heard of. Sutton Bank. You did not sign up with Sutton Bank. You signed up with Cash App.
Sutton Bank is real, it has existed since 1878, and it genuinely issues your card. It is also not Cash App, does not hold your balance, cannot see your transactions, and says all of this on its own website in capital letters.
Sutton Bank is a real, active, FDIC-insured bank — certificate 5962, Attica, Ohio, established 1878 — and it issues the Cash App card. It is a separate company from Cash App, which is a product of Block, Inc. Its own support page states that at all times other than the moment you are spending, your Cash Card account holds a zero balance. So the bank whose name is on the card is not the place your money sits, cannot show you your history, and will send you back to Cash App for almost every question you have.
The bank says it louder than the app does
Most explanations of this arrangement come from the app's side, buried in a cardholder agreement. The clearest statement of it is on the bank's own website, and it is not subtle. Sutton Bank's prepaid card support page opens its Cash App section like this, capitals and all:
“PLEASE NOTE THAT WE DO NOT ISSUE, MAINTAIN, OR SERVICE YOUR CASH APP ACCOUNT, WHICH IS OFFERED BY SQUARE, A SEPARATE COMPANY THAT WE ARE NOT AFFILIATED WITH.”— Sutton Bank, prepaid card support page
That is a bank going out of its way to tell you it is not the company you think it is. It reads oddly because most people assume the name on a card is the institution they are dealing with. Here it is a manufacturing credit, not a relationship.
The account that is not there
This is the part that resolves nearly every question people arrive with, and it is the part nobody explains. From the same page:
“If funds are available, your Cash Card account is loaded with funds from your Cash App when you use your card in making purchases or ATM withdrawals. At all other times, your Cash Card account has a zero ($0) balance.”— Sutton Bank, prepaid card support page
Read that again, because it is stranger than it looks. There is a Sutton Bank account attached to your card, and it is empty. Money moves into it at the instant you tap the card and leaves immediately. The rest of the time — which is to say almost all of the time — it holds nothing at all.
Once you know that, three things stop being mysterious. Sutton Bank cannot show you a balance because there usually is not one. It cannot show you your transaction history because, in its own words, your Cash App account is not held with Sutton Bank. And you cannot enrol the card in Sutton Bank's online banking, because there is no ongoing account there to log into.
Which of these is actually your question?
People arrive at this name from three completely different situations, and they need three different answers. Almost every page about it answers only the first.

Why the confusion is the opening
An unfamiliar bank name attached to your own money produces a very specific behaviour: people search for it, quickly, while worried. That search is the vulnerable moment, and it is the reason this page exists.
Two things make it worth handling carefully. The first is that the results for a name like this are not curated by anyone — the space is filled with review aggregators, forum threads and pages that have nothing to do with banking, which means a convincing fake has very little to compete against. The second is that a search made in alarm is exactly when someone dials the first number they see.
It is not only Cash App, and it is not only Sutton Bank
Once you see the pattern you will find it everywhere, because it is how consumer fintech is built. The app you use is rarely the bank holding the licence. Sutton Bank's own support page lists Robinhood, Albert, Vanilla Gift, the Providers Card and Square Checking alongside Cash App. Cash App itself uses two issuers, Sutton Bank and The Bancorp Bank. The Bancorp also sits behind other well-known apps.
Which means the specific answer here — Sutton Bank issues the Cash App card — is less useful than the general one. An unfamiliar bank name on a card, a statement line or a direct deposit form is the normal architecture of the industry showing through. It is worth understanding, and it is not, by itself, evidence of anything wrong.
What deserves your attention is not the unfamiliar name. It is a charge you cannot place, a card you did not order, or a stranger offering to help you with either.