Everyone should commit to memory the number of the national poison center hotline number: 1-800-222-1222. There is actually a network of 65 poison centers around the US. When you call that number, you'll be prompted to enter your ZIP code and you'll be connected to your regional hotline.
There's also a hotline for poisoned animals: Kansas State University's College of Vet Med runs an animal poison center hotline at 785-532-5679. If you think your animal has been poisoned, an on-call veterinarian is available to help.