There are many writing genres including, but not limited to, fiction, non-fiction, children’s, self-help, and spiritual writing. Most publishing companies will publish any of these with a few exceptions. Finding the right publishing company will take some research on your part. A trip to a bookstore or surfing Amazon can help.
If your niche is children’s, go to the children’s section and check out the publishers. You will find that a few publishers will start to stand out. Make a list and dig further with a website search. A lot of published authors will write reviews of the publishers they have used. This is especially important if you’re going with a vanity publishing house or self-publishing.
Knowing your exact genre can help. There are so many sub-genres from the five listed above that it pays to know what category your writing fits before searching for a publisher. There are a few websites that provide a complete list of genres. One can be found here.