Could be because sites like that don't realize it's available nationwide by joining an organization.
Similarly, it isn't listed at DepositAccounts with the default settings for my region, but if I change the region to "Any", it shows up.
There has been some confusion about the membership requirements. Here is what DepositAccounts says:
However, the first sentence is no longer correct, as anyone who joins PRPS is eligible, and PSECU pays half of the $20 membership fee.Membership in Pennsylvania State Employees Credit Union is open to all Pennsylvania residents through membership in the Pennsylvania Recreation & Parks Society ($20 membership fee). Membership is also open to Pennsylvania state or local government employees, municipality or school district employees, students, faculty, staff and alumni of universities in the Pennsylvania State System, and over 1,000 Select Employer Groups.
Speaking of the membership fee, be sure to leave $20 in your share account, including the $10 PSECU deposits for you. I didn't do that, figuring that any fees would have been charged when I first joined, but they charged it several days later, and I ended up with a negative balance. There also was a $30 overdraft charge, but it was reversed before I even saw it. I called, and the rep said no problem as long as I planned to make a deposit soon. I must wait another week or so, as I linked PSECU from Vanguard, and VG doesn't let you transfer to a new bank for 7-10 days after setting it up.
Between my two CD purchases, the payment to PRPS, and the overdraft withdrawal, I'm already at four withdrawals for the month, so am hesitant to set up a link to PSECU from another bank, as the withdrawal to reverse the trial deposits would put me at five, leaving only one for the rest of the month.