Latex paint is very similar to Acrylic paint, both are water based. Acrylic is a bit more elastic than Latex paint and more suitable for harsh weather conditions when used as for exterior painting.
1) Contact your local recycling center. Latex paint is recyclable and a lot of paint companys are recycling old latex paint.
2) You can donate it to an organization, such as Habitat For Humanity.
3) Latex paint is not hazardous, as of 1992 it has not contained mercury, you can leave the lid off of it, add cat litter to it, let it harden and put it out with your regular trash, but it has to be hardened.
Kellogg's Painting donates all paint that we do not use
Banks Building recycles old Acrylic paint.