Can someone help me find a website to help me do my Government project [read the details]?

We're doing a multi venn diagram to show the difference in political powers between National, State, County, and Township. I already have National and State but since I have no book with me and I need to turn this in Monday I need to use google, which isn't really helpful when I use and words like "political, powers, county, township, national". Help please?