Ms. Egan’s postcards of choice feature literary quotes from authors like Jane Austen and Virginia Woolf, but those looking to address the current administration have ever-increasing options of cards designed by stationery makers and artists specifically for writing lawmakers. Many companies are selling the postcards at cost or donating a portion of the proceeds.

Image These flaglike cards from Paperless Post are available in yes and no versions. Credit... Paperless Post

Dahlia Press, which is based in Seattle, released four female-empowerment illustrated postcards, including one with a hand with red fingernails holding an olive branch and “Tough as Nails” written across the wrist ($12 for eight). Stephanie Clarke, the company’s founder, intended the cards to be appropriate whether the sender wanted to encourage lawmakers to better support women or to thank those who were.

“I didn’t want the cards to come across as aggressive,” Ms. Clarke said. “I kept them very soft and feminine and peaceful.”

Saying thank you is one of the purposes of the Waterknot Super Pak (Postcard Action Kit) collection, which includes messages like: “Thanks for working for justice. You’ve got my vote!” For those with whom a sender disagrees, one option is “Work for love to earn my vote” on a purple card with darker purple writing ($12 for 18). Two companies, Bench Pressed in Minneapolis and the Firecracker Press in St. Louis, offer postcards reminiscent of party invitations that prompt the sender to fill in the blanks with things like a hometown, issues of concern and why the topic is important.

Paper Chase Press goes one step further, with full-page stationery that requires an envelope. The 40-year-old Los Angeles press and bindery company, whose clients include Marc Jacobs and the Ace Hotel group, just introduced an Official Correspondence series ($12 for 12), including letterhead on thick eggshell-color paper with a circular logo reading “The Office of Concerned Constituents.”