IIRC a few - (poss. also Northbrook and Des Plaines).
As an example - Highland Park:
Article 90 - Introduction (1) Section 90-8 (c) shall be added to read as follows: 172-1
90-8. (c) - Wiring Planning. In new construction, for future expansion, a minimum of ten percent (10%) of the available spaces in a panel shall be provided as spares or blank.
Section 230.23(a): At this end of this subsection, the following shall be added: "All residential service revisions shall be a minimum 100 amp with twenty (20) circuit openings and have a main circuit breaker. The service entrance conductors must be a minimum of three (3) #3 copper wire and be installed in a minimum of not less than one and one-quarter inch (1-1/4") conduit. The panel must have 10% of spare space at final inspection.
They have a 15% minimum for commercial, retail, and industrial panels.
[This message has been edited by DougW (edited 02-01-2007).]