A package workbook that demonstrates an example of the situation and data would help a great deal here. Please review Packaged workbooks: when, why, how for more information on that.
If the Lat/Long values are persistent across many rows and they can be utilized as Dimensions, then you could group on them. Seeing some example of data would help a lot though to show what's possible or not.
Be sure to share the version of a workbook if you do post one.
Apart from what Patrick said above, my initial thoughts are to drag sum([number of records]) onto the label shelf.