The plot request plots Density on the vertical axis, CrimeRate on the horizontal axis, and uses the first letter of the value of State as the plotting symbol. This makes it easier to match the symbol with its label. The label variable specification ( $ state) in the plot request labels each point with the corresponding state name. BOX draws a box around the plot. LIST= lists the labels that have penalties greater than or equal to 1. HAXIS= and VAXIS= specify increments only. PROC PLOT uses the data to determine the range for the axes.
proc plot data=census;
   plot density*crimerate=state $ state / box list=1
        haxis=by 1000 vaxis=by 250;
   title 'A Plot of Population Density and Crime Rates';