Marion, Ohio, is in area code +1 740.
(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Area code 302 is the entire state of Delaware. Area code 740 is southeastern Ohio, including Marion and Zanesville. It's over 300 miles between them, depending on where in each area code you measure from.
The area code(s) for Toledo, Ohio are 419 and 567.
Mount Vernon, Ohio, is in area code 740.
There are currently 10 area codes in Ohio. When Ohio needs more area codes they will introduce an eleventh area code for the Columbus/Central Ohio area and a twelfth area code for the Cincinnati region.
Feesburg is in area code 937.
A zip code is for a town or a portion of a city. An area code is for a state or part of a state. An area code cannot determine the actual zip code location. The area code for (614) is for a large chunk of Ohio.
Defiance, Ohio, is in area codes 419 and 567 (overlay).
Area code 740. Area code 220 will be added as an overlay in 2015.
Marion County Courthouse - Ohio - was created in 1884.
Zanesville, Ohio
It depends greatly on where in area code 740 (southeast Ohio) and somewhat on where in area code 513 (Cincinnati area).
Area code 614 is Columbus, Ohio; area code 419 (and overlay code 567) is in Toledo, Ohio, but also includes cities like Findlay, Lima, Sandusky, and Mansfield. At the closest, there is only about 10 or 12 miles between area code 614 and area code 419/567.