density calculation using cursors in arcpy module

[GregAranea]

deleted

[DanPatterson_Retired]

I would first suggest doing it manually, then copy to a python snippet... see details here

Using the Results window—Help | ArcGIS for Desktop

[GregAranea]

thank you

[WesMiller]

You may be working harder than you need to:

Use Spatial Join—Help | ArcGIS for Desktop  to get a count of your wells in each county

And then use it again(the other way around) to create a table with wells and county names, then you can Add Join—Help | ArcGIS for Desktop  to your wells then use Calculate Field—Help | ArcGIS for Desktop to populate your field with county.