clustering polygons by sum value

Discussion created by rememberit21 on Dec 11, 2013
Latest reply on Dec 12, 2013 by dlee-esristaff
I would like to group polygons that (1) are contiguous and (2) when the value of field X = Y.
Specifically I am grouping zipcodes that are connected. a group is when 1 or more zipcodes 'population' field equals 100,000.

Can someone suggest an existing ArcGIS function or python method for doing this?

Many thanks in advance!  Gloria