I don't know if the software can handle this without crashing, but I am certain your audience will not be able to visually distinguish which bar represents which city.
Better, you should do some geographic plotting of your data like this PROC SGMAP example.
By SAS Graph do you mean the old device based procedures like Gchart? The newer SGPLOT/SGPANEL have more options.
The following apply to Sgplot (or Sgpanel):
You might consider using a VECTOR plot. That would require a bit more work on your part as you would need to calculate the start/end value for each segment but I think it is less likely to have issue with the number of plot items. The real question may be how indicate the city as text has to be readable.
Or maybe a Heatmap. On dimension as the city (I think you need to have the variable as numeric and use the Bin options to make each city one bin) then have the 6 categories as the other and use a calculated value (percent? rate?) as a response to show "low" to "high" values.
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