If you need to know an ABA routing number for which you can't just look at a check, and you don't want to wait for a response from customer service, try:

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I needed this for my VirtualBank account today.

Great site. Thanks

Thanks OP!

In cases where a bank does have more than one, it's often helpful to look at the cities.

Using Chase as an example, I would assume all of the following:

JP Morgan Chase is formerly Chase Manhattan, is the bank itself: 021000021
Chase USA NA Wilmington DE is probably the Chase Credit Card Division: 031100144
JPM Chase Texas is for those Texas banks formerly part of Texas Commerce Bank: 113000609

Even if I'm wrong, if you click on the More button, it will give you the full, official name of the bank, which you can then match to your documents to determine the correct one.

A = 01 or 21 = Boston
B = 02 or 22 = New York
C = 03 or 23 = Philadelphia
D = 04 or 24 = Cleveland
E = 05 or 25 = Richmond
F = 06 or 26 = Atlanta
G = 07 or 27 = Chicago
H = 08 or 28 = St. Louis
I = 09 or 29 = Minneapolis
J = 10 or 30 = Kansas City
K = 11 or 31 = Dallas
L = 12 or 32 = San Francisco