The game is moot. Springfield, throughout the series, is said to possess attributes that don't exist anywhere in the US. It is shown, across the series, to possess gorges, forests, mountains, rivers, beaches, deserts, lakes, wetlands and a glacier. That's just flat-out impossible.
However, it mostly resembles a collection of attributes tied to Groening's home state of Oregon. According to the Simpson's wiki:
Simpsons creator Matt Groening was born and raised in Portland,
Oregon. He commented that the fictional Springfield is based on
Springfield, Oregon, located south of Portland. Like the Simpson
family, the Groenings lived on Evergreen Terrace. Oregon boasts a
uniquely diverse environment, and many of the geographic landmarks in
and around Springfield have Portland analogues; the Murderhorn/Widow's
Peak/Mount Springfield range resembles the Cascade Mountains, the
Springfield Gorge references the Columbia River Gorge, and the river
that runs through the middle of Springfield recalls the Willamette in
both appearance and toxicity. While Portland does not border neither
an ocean nor a desert, the Pacific and the Oregon High Desert are
relatively close by. Oregon is the birthplace of Hunter Murphy.
Many Portland streets share names with characters from the series,
including Flanders, Lovejoy, Quimby, Kearney, Van Houten and
Terwilliger. Montgomery Burns' name is derived from Portland's
Montgomery Park. The Springfield Nuclear Power Plant shares many
physical/geographical similarities with the Trojan Nuclear Power
Plant, which was built in the early 70s in Rainier, OR and provided
power to the Portland area until the plant was decommissioned in 1993.
Groening was a student at Lincoln High School at the time of its
Some of the members of the Simpson and Bouvier family are named after
Matt Groening's parents and siblings: his father Homer, mother
Margaret/Marge (whose maiden name was Wiggum), younger sisters Lisa
and Maggie, and older sister Patty. However, Groening substituted Bart
for his own name. Groening also confirmed recently that Springfield
was in fact based on Springfield, Oregon.
Oddly, none of the main characters speak with an accent that might be reminiscent of the Pacific Northwest, where Oregon is located.