$10k or $20k is definitely too much of a jump, even for the banks (like Amex and GE) that are known to be generous. OTOH, when you call for an increase, they'll nearly always ask you to name a figure that you want and won't accept an open-ended "whatever you can give me" request.
In your shoes, I might ask for $2.5k or $3k. Some MyFicoans would probably suggest you be bolder, but that seems realistic to me. If you're actually planning a big purchase or a big trip, you could ask for more, citing the upcoming expense as your reason.
Before doing anything, I'd find out whether the bank in question requires HPs or will give a CLI with an SP.
Since you have a credit score from the card I will assume that you have had the account open for greater than 6 months. If that is the case I would either call or go on line in the account and find a Request Credit Line Increase button (We call it a Luv Button) around here. You may be stretching in asking for a 10,000 limit but more surprising things have happened. In any event most creditors if they cannot give what you ask will provide a counteroffer. I am not familiar with US Banks policies but someone will chime in who knows them. Congratulations on maintaining positive credit behavior at such a young age. And if you stick around here and learn you will be a credit guru in no time.
Just saw your editied reply. If both of those other cards are in your name and not authorized user I would definetely hit up US Bank.
Starting Score: 500's
myFICO is the consumer division of FICO. Since its introduction 20 years ago, the FICO® Score has become a global standard for measuring credit risk in the banking, mortgage, credit card, auto and retail industries. 90 of the top 100 largest U.S. financial institutions use the FICO Score to make consumer credit decisions.
>> About myFICO
