Parks & Recreation shows us many different types of people. People with various passions, people of various backgrounds, people with different beliefs, and so forth. If these characters were college majors, these would be my best inferences having watched the show completely TWICE without skipping an episode. Some of these aren't majors, but they are unrecognized majors by a university, but in all reality, everyone knows they have just as many students in these areas of "study" as any other major. Hopefully you'll find some good humor from and insights into this amazing comedy.
Andy Dwyer: Undecided
Andy is excited by just about everything, and so he'd never be able to decide and be stuck taking random classes such as Beginner Guitar and Women's Studies.
Leslie Knope: History with a minor in Woman's Studies
She couldn't decide what she wanted to do exactly. so she decided to do a bit of everything she loves. Leslie is, well, Leslie.
April Ludgate-Dwyer: Pre-Vet
Seems obvious now that she is head of Animal Control. Only things she likes: hating people, animals, and Andy.
Ron Swanson: Woodworking
Ron Swanson only loves few things: wood, silence, and meat. His major is an unpopular one which is 90% of his attraction to him. He learned even more about wood from other techniques although he will never use them besides woodworking jokes.
Ann Perkins: Nursing
Obviously this multi-ethnic sunfish had to become a Registered Nurse to save all those lives in Pawnee, Indiana.
Tom Haverford: Entrepreneurship
Boiling over with ideas, Tom is an entrepreneur through-and-through. His ideas for everything such as adding Glitter to butter and laundry detergent.
Ben Wyatt: Finance
And a minor in The Cones of Dunshire. He is smart and knows his stuff, boring and professional, Ben Wyatt is the most basic CPA.
Chris Treager: Health and Exercise Science
How else would he know all the facts about exercising and health and nutrition? He clearly studied what he loves so much.
Mark Brendanawicz: Urban Planning
He studied where he ended up, until he left for the private sector. He was a straight-forward thinker and man. He knows how to do his job well and does. He may be a beast in the sheets, but a bore in the office.
Donna Meagle: Psychology & Interior Design
She knows how to manipulate people and use what she gains in knowledge to use to her advantage at some point. She also loves realty and knows how to make everything stylish.
Jerry Gergich: Management
He is an office manager. He meant to achieve more but never got around to it... Oh well he has a STUNNER for a wife.
Craig Middlebrooks: English
He knows how to use words to his advantage. His extensive vocabulary is and aid and hinderance as he often wants to find the perfect word and can't.
Perd Hapley: Communication
He had to study how to communicate. As a reporter, who reports reportable things, Perd Hapley learned his communication skills, at a school, somewhere, for some amount of time.
Jean-Ralphio Saperstein: Frat boy
He never did declare a major because he's the WORRRRST. Jean-Ralphio is one of the laziest dreamers to exist, but he'd have joined a fraternity and thought hazing and initiation was a joke, and now is loving hazing his new brothers with extreme options.
Councilman Howser: Government
Possibly the only man in the show who tries to do his job well and go home and leave government politics out of his life. Councilman Howser wants to avoid Leslie and basically everyone. He is the only level-headed man who wants to actually do his job.
Councilman Jamm: Dentistry
His true passion besides screwing people over. He loves teeth just about as much as he loves himself. Government is merely a side show to give himself a larger ego boost.
Councilman Dexhart: Gynecology
Already having seen many female's netherland regions, Dexhart should have majored in gynecology not government. He'd enjoy it more anyways in his sick, perverted way.
Shauna Malwae-Tweep: Journalism
Obviously she studied this, when she wasn't so focused on boys and which relationship she was in. even if it was with herself and not a boy. Oh Shauna, a real fixer-upper.
Ethel Beavers: Administration
Ethel Beavers, the crotchety elderly woman who works on the fourth floor, was likely the first woman in Pawnee to go to college, and it was probably for administration, something womanly... A secretary basically for her life, she kept her private life private but is a kick-ass woman defying the odds of a woman of her age. Ethel Beavers is the best possible grandma now.
Jennifer Barkley: Political Science
She knows her stuff, but as soon as she became a big shot, she didn't care what she learned, she was going to do whatever she wants.
Diane Lewis: Education
With a strong knowledge of educational philosophy, how to deal with kids, and how to be a secure woman as well. She is a kick-ass teacher and administrator along with mom and soul-mate level match for Ron Swanson.
Mona-Lisa Saperstein: Dropped out in high school
The psychotic woman she is, would have lost her interest in school to pursue her dreams of drugs, sex, and MONEY PWLEASEEE. *bleck*
Tammy One: Accounting (CPA certified)
The legitimate definition of a gold digger, as all she's ever been after is Ron's gold supply. Oh, she knows the gold's value because she's an insanely gifted as an accountant.
Dennis Feinstein: Marketing
His ability to market some sh*tty smelling scents is amazing. Marketing is his forte and he clearly had an extensive amount of marketing courses. He is so good, in fact, that he can be a prick and still make millions.
Tammy Two: Library Science
To be the awful Librarian she is, Tammy Two would have spent her time cackling with the other Library Science majors... AKA THE WORST PEOPLE ON EARTH!
Orin: Studio Art
Of course, art major allows him to brew his creepy art ideas in peace. The way he likes it.
Jessica Wicks: Gold digging aka never graduates but has a husband by the time she drops off
She's the most basic and open gold digger in Pawnee. She would only go to the most expensive college to find the most wealthy college student at the school. As soon as she has the ring, she drops out.
Bobby Newport: Dad owns the college
He has no clue what he's doing there besides drinking and playing video games. He has no idea what classes he even takes, but no one says anything because his dad provides the biggest endowment to the school.
Parks & Rec has a great variety of people who represent a great variety of majors. This huge variance in people shows the "diverse" area of Pawnee Indiana: 3rd in obesity, 1st in morons.