I can’t ever remember these, and (as of 2006) wasn’t able to easily find them on the internets.
International court (World Squash Federation spec (WSF)) vs North American Singles (US Squash Racquets Assoc. (USSRA)). USSRA specifies in English units, which I’ve converted to SI for ease of comparison.
|H: serve line||1.98m||1.78m|
|L: return box||3.05m||4.26m|
|Serve box||1.37m (arc radius)||1.60m (square)|