Crossing the line separating Indiana and Illinois sometimes means dealing with different laws and customs. Readers are asked to share ideas for this weekly feature. This week: Counties.

Despite the efforts of local government reform advocates, Illinois and Indiana both rank high for the number of counties within their borders.

Illinois' 102 counties are seventh-most among the states, surpassed only by Texas (254), Georgia (159), Virginia (133), Kentucky (120), Missouri (115) and Kansas (105).

Indiana boasts 92 counties, nearly as many as Illinois and good for 12th nationally, even though it has only slightly more than half the population of its neighbor to the west.

Arizona, which has 134,000 more residents than Indiana, gets by with just 15 counties. The tiny states of Delaware (three) and Rhode Island (five), not surprisingly, have the fewest.

In terms of population, Chicago's Cook County has the second-most residents of any county in the nation behind only Los Angeles County, Calif.

Lake County is second to Indianapolis' Marion County for Indiana county population. Porter County ranks ninth.