There is a database of these on the web. So try searching, also.

Taken from Ameritrade's help center:

How do I wire funds into my TD AMERITRADE account?

You can deposit funds into your TD AMERITRADE account via a wire transfer at no charge from TD AMERITRADE. Domestic wires typically require one business day to process while foreign wires require between two to three business days.

Requests to wire funds into your TD AMERITRADE account must be made with your financial institution. To do this, provide your financial institution with the following information:

Send wire transfers to TD AMERITRADE as follows:
First National Bank of Omaha
1620 Dodge Street
Omaha, NE 68197
ABA# 104 000 016
Credit the account of TD AMERITRADE, Inc.
Account # 16424641

For further credit to:
[client name]
[acct number]

If you have questions or concerns about a wire transfer, please contact TD AMERITRADE (not First National Bank of Omaha).

It's 021000021 on the bottom of my checks which corresponds to JP Morgan Chase (which is printed on the checks).

I would not assume that this will work if you don't have a linked checking acct though.

tom885 said:Is there any prefix or trailer to your TD Ameritrade account number printed on the check ?
(TD account number is 9 digits) I see no relationship between my TD checking account number and my (TD) Ameritrade account number - its a completely new number.