Nobody browses for an ATM until they need one, so consider this the map to keep handy. Reading holds the majority of the machines listed here, with Wyomissing and Shillington next, and the mix runs from bank-branch ATMs to standalone machines in delis and corner stores, plus a handful of Bitcoin ATMs for the crypto-inclined.
The only choice that matters is fees. Your own bank's machine usually costs nothing. A standalone machine charges for the convenience, which is a fair trade at midnight and an annoyance at noon. A Bitcoin ATM is a different animal entirely, with fees worth studying before you touch the screen.
Worth asking your bank: some accounts refund out-of-network ATM fees, which quietly turns every deli machine in Reading into a free one. People do review these things, by the way. The machine at Misael Deli Grocery in Reading has its own small fan club, which might be the most Reading thing on the site.