Alamosa State Bank Routing Number

What is an ABA routing number?

An ABA routing number, also called a routing transit number (RTN), is a 9-digit code that identifies a U.S. financial institution in the payment system. It tells ACH transfers, Fedwire payments, and paper checks which bank to route money to. The format was created by the American Bankers Association in 1910 and is still the backbone of U.S. domestic payments.

What is the difference between a routing number and an account number?

Your routing number identifies the bank; your account number identifies your specific account at that bank. On a paper check, the routing number is the 9-digit number in the bottom-left, and the account number is to its right.

What is the Alamosa State Bank routing number?

The Alamosa State Bank routing number is 102100853. It is the primary ABA routing transit number registered to Alamosa State Bank, headquartered in Alamosa, CO. A bank can hold more than one routing number, so this is the one on record for the institution, not necessarily the one printed on every check. The number comes from the FFIEC National Information Center institution record, last refreshed here on October 8, 2026.

What is the Alamosa State Bank wire routing number?

This page lists 102100853, the primary routing number registered to Alamosa State Bank. The record does not say whether the bank uses the same number for wire transfers, and many banks use a separate routing number for domestic wires. Confirm the wire routing number with Alamosa State Bank before sending a wire.

Is ABA number 102100853 the routing number for Alamosa State Bank?

Yes. ABA number 102100853 is the primary routing number registered to Alamosa State Bank. Check it against the routing number on a check or in your online banking before sending an ACH payment, because a bank can use different numbers by region or product.

Which bank uses routing number 102100853?

Routing number 102100853 belongs to Alamosa State Bank, headquartered in Alamosa, CO. It is the bank's primary ABA routing number (FDIC certificate 13947).

Routing numbers of similar-size institutions in Colorado

Bank, Alamosa, CO

San Luis Valley Federal Bank: 302174728

Credit union, Alamosa, CO

Valley Educators Credit Union: 302174317

Credit union, Littleton, CO

Red Rocks Credit Union: 302088092

Bank, La Junta, CO

The Colorado Bank and Trust Company of La Junta: 102100675

Bank, Fort Morgan, CO

FMS Bank: 107003942

Credit union, Denver, CO

Affidian Federal Credit Union: 302075283

Bank, Denver, CO

Native American Bank, N.A.: 102007273

Bank, Boulder, CO

Flatirons Bank: 107006839

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