The state of Iowa does not specify a size for the professional engineer stamp. We offer the Iowa professional engineer stamp in one size; 1 5/8 inches.
In case you have any questions on the Iowa professional engineer stamp requirements or any other regulatory questions, we have included the Iowa Engineer boards contact information below for your convenience.
Iowa State Board:
Iowa Professional Licensing Bureau
200 E. Grand Ave, Suite 350
Des Moines, IA 50309