Tools tab > Utilities group > 
(Display object information) menu > List layers and count, LAYERLIST
The program lists the following information on all layers in the current drawing:
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Name
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Status
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Color
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Linetype
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Line weight
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Plot
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Number of graphical references
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Number of table references
The number of graphical references corresponds to the number of graphical objects on a layer. The number of table references corresponds to the number of symbol definitions and text and dimension styles. If there are no references to a layer, then that layer has no objects or symbols on it and you can remove the layer using the Purge command.
The program displays the layer information on the command line and in a separate text window. The program also copies the information to the Windows clipboard, and you can paste it to a a text editing application or a spreadsheet application.