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I'm creating a map with two shapefiles. One is a polygon of counties. The other is points of cities. I used the function intersect to group the cities in each county. I'm trying to get the number of cities in each county to show up in the legend. For example in County A there are 16 cities...In county B there are 7 cities...and so on. I'm trying to create a choropleth map that shows the number of cities in each county

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You can get a count of cities in each county by doing a spatial join. This will create a new shapefile with a new column in the attribute table called "Count."

You can set your map symbology based on that column to create a choropleth map.

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You don't mention what version of ArcGIS you are using,but if it is 10.1 you can add the feature count in the legend

You can also add feature counts to your legend by checking the Show feature count check box.

Its half way down the page.

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