Photos yes, standard Hallmark cards no, and understanding why the distinction exists helps you send something that actually arrives.
Family photos are accepted at most county jails when sent through an approved channel. InmateAid prints photos on glossy 4x6 stock and mails them through USPS in envelopes that mailroom staff recognize and trust. The photos go through the standard inspection process and get delivered at mail call. Sending a family photo is one of the most meaningful things you can do for someone inside, and it holds up over time in a way that words on a page do not.
Store-bought Hallmark cards are a different story. Most county jails and prisons have stopped accepting commercially produced greeting cards from outside retailers because they have become a known method for introducing drugs into facilities. The paper, the envelope, even the adhesive can be treated with synthetic substances that activate when handled. Facilities responded by restricting or banning outside greeting cards entirely, and that policy is now widespread.
What InmateAid offers as an alternative is a greeting card delivered on a jail-approved postcard format. These go through the same USPS channel as everything else InmateAid sends, come in a format that facilities already accept, and give you hundreds of designs to choose from across occasions and sentiments. The message gets through. The format is approved. Nothing gets turned away at the mailroom.
If you want to send both a photo and a card, InmateAid handles both in a single order and both go out through a process the facility already recognizes and accepts.