Here is a list of chapbook publishers. Most of these are in no particular order, and I’m only listing a few publishers that accept unsolicited submissions and don’t charge a fee.
Prolific Press has to be on top of this list. They are very well respected with a huge following and they make beautiful books. “The Prolific Press Chapbook Series celebrates the tradition of chapbooks by offering a publication venue intended to support writers.”
Dancing Girl Press is a favorite of mine, because they offer neat chapbooks and focus on publishing female writers. “The press has published over 300 titles by emerging women poets in delectable handmade open-run editions.”
Ugly Duckling Presse seems to invite people from all over the world to submit. “We look forward to receiving submissions from all corners, and we especially encourage submissions from new writers, translators, and people living outside the US.”
Underground Voices is edgy. “Underground Voices started as an online literary magazine in 2004 publishing hard-hitting, raw, dark fiction, flash fiction and poetry.”
Anvil Press is established, but may only accept Canadian writers. “Anvil Press is a literary publisher interested in contemporary, progressive literature in all genres. We must stress that we are a small publisher, publishing 10 – 12 titles per year.”
Red Bird Chapbooks seems like a creative bunch. “We publish quality, handcrafted chapbooks, broadsides and pamphlets that introduce aspiring and inspiring writers and artists to a larger audience.”
You can find more chapbook publishers by searching Google or Bing for chapbook contests or by sifting through the listings at Duotrope. Almost all other chapbook publishers are vanity presses because they charge fees, or have hidden fees (like they make you sell copies in advance). If you know of some other chapbook publisher that has no fee, let me know!