I've been tinkering with some historical minor league stats recently. There's only so much readily out there; for the most part, you're looking at career stats for active players. As I discovered, that's plenty right there.
For reference, there are roughly 200 affiliated minor league teams out there. More if you count the Dominican Summer League, more still if you count the Mexican League, which is technically Triple-A, but doesn't really function that way. Then there are the independent league teams, everywhere from Reno to Fargo to Elmira, which add another 100 or so in any given year.
But, for those of us who do things like keep giant databases, the numbers are even bigger still. Minor league franchises are constantly moving, changing, folding, and simply renaming themselves to make my life a little bit more complicated. Long story short, there are over seven hundred non-MLB teams that at least one active MLB or MILB player has played on. That counts everything from the affiliated minors to indy leagues to foreign leagues such as those in Japan and Taiwan.
Below the jump, you'll find the full list. I put it below the jump, because if this list was above the jump, I'd probably break something.
Appleton MDW A Battle Creek MDW A Beloit MDW A Burlington MDW A Cedar Rapids MDW A Clinton MDW A Dayton MDW A Ft Wayne MDW A Kane County MDW A Kenosha MDW A Lansing MDW A Madison MDW A Michigan MDW A Peoria MDW A Quad Cities MDW A Rockford MDW A South Bend MDW A Springfield MDW A Sw Michigan MDW A W Michigan MDW A Waterloo MDW A Wausau MDW A Wisconsin MDW A Albany SAL A Asheville SAL A Augusta SAL A Cap City SAL A Cape Fear SAL A Charl SC SAL A Charl WV SAL A Columbia SAL A Columbus SAL A Delmarva SAL A Fayettevlle SAL A Florence SAL A Gastonia SAL A Greensboro SAL A Greenville SAL A Hagerstown SAL A Hickory SAL A Kannapolis SAL A Lake Cty SAL A Lakewood SAL A Lexington SAL A Macon SAL A Myrtle Bch SAL A Piedmont SAL A Rome SAL A Savannah SAL A Spartanburg SAL A Sth Georgia SAL A Sumter SAL A W Virginia SAL A Wilmington SAL A Bakersfield CAL A+ Central Val CAL A+ Fresno CAL A+ High Desert CAL A+ Inl. Empire CAL A+ Lake Elsinore CAL A+ Lancaster CAL A+ Modesto CAL A+ Mudville CAL A+ Palm Sprngs CAL A+ Rancho Cuca CAL A+ Riverside CAL A+ Salinas CAL A+ San Bernardino CAL A+ San Jose CAL A+ Stockton CAL A+ Ventura CAL A+ Visalia CAL A+ Danville CAR A+ Durham CAR A+ Frederick CAR A+ Hagerstown CAR A+ Kinston CAR A+ Lynchburg CAR A+ Myrtle Bch CAR A+ Peninsula CAR A+ Potomac CAR A+ Pr William CAR A+ Salem CAR A+ Wilmington CAR A+ Winston-Sal CAR A+ Baseball Cy FSL A+ Brevard Cty FSL A+ Charlotte FSL A+ Clearwater FSL A+ Daytona FSL A+ Daytona Bch FSL A+ Dunedin FSL A+ Ft Laud FSL A+ Ft Myers FSL A+ Jupiter FSL A+ Kissimmee FSL A+ Lakeland FSL A+ Miami FSL A+ Osceola FSL A+ Palm Beach FSL A+ Sarasota FSL A+ St Lucie FSL A+ St Pete FSL A+ Tampa FSL A+ Vero Beach FSL A+ Winter Havn FSL A+ Wst Plm Bch FSL A+ Akron EL AA Albany EL AA Altoona EL AA Binghamton EL AA Bowie EL AA Cant-Akron EL AA Connecticut EL AA Erie EL AA Glens Falls EL AA Hagerstown EL AA Harrisburg EL AA London EL AA Lynchburg EL AA N Hampshire EL AA Nashua EL AA New Britain EL AA New Haven EL AA Norwich EL AA Pittsfield EL AA Portland EL AA Reading EL AA Trenton EL AA Vermont EL AA Williamsport EL AA Birmingham SL AA Carolina SL AA Chattanooga SL AA Columbus SL AA Greenville SL AA Huntsville SL AA Jacksnville SL AA Knoxville SL AA Memphis SL AA Mississippi SL AA Mobile SL AA Montgomery SL AA Nashville SL AA Orlando SL AA Port City SL AA Tennessee SL AA West Tenn SL AA Arkansas TEX AA Beaumont TEX AA Cor Christi TEX AA El Paso TEX AA Frisco TEX AA Jackson TEX AA Midland TEX AA Round Rock TEX AA San Antonio TEX AA Shreveport TEX AA Springfield TEX AA Tulsa TEX AA Wichita TEX AA Buffalo AA AAA Denver AA AAA Indianapolis AA AAA Iowa AA AAA Louisville AA AAA Nashville AA AAA New Orleans AA AAA Okla City AA AAA Omaha AA AAA Buffalo INT AAA Charlotte INT AAA Columbus INT AAA Durham INT AAA Indy INT AAA Iowa INT AAA Louisville INT AAA Norfolk INT AAA Ottawa INT AAA Pawtucket INT AAA Richmond INT AAA Rochester INT AAA Scr-WB INT AAA Syracuse INT AAA Tidewater INT AAA Toledo INT AAA Albuquerque PCL AAA Calgary PCL AAA Col Sprngs PCL AAA Edmonton PCL AAA Fresno PCL AAA Hawaii PCL AAA Iowa PCL AAA Las Vegas PCL AAA Memphis PCL AAA Nashville PCL AAA New Orleans PCL AAA Oklahoma PCL AAA Omaha PCL AAA Phoenix PCL AAA Portland PCL AAA Round Rock PCL AAA Sacramento PCL AAA Salt Lake PCL AAA Tacoma PCL AAA Tucson PCL AAA Vancouver PCL AAA Coa Bend AA IND El Paso AA IND Fort Worth AA IND Lincoln AA IND Pensacola AA IND Shreveport AA IND Sioux Falls AA IND St. Joe AA IND St. Paul AA IND Montgomery AAA IND Tennessee AAA IND Tyler AAA IND Aberdeen ATL IND Atlantic City ATL IND Bridgeport ATL IND Camden ATL IND Lancaster ATL IND Lehigh Val ATL IND Long Island ATL IND Nashua ATL IND Newark ATL IND Pennsylvnia ATL IND Road Warriors ATL IND Somerset ATL IND Greenville BSL IND Tennessee BSL IND Brockton CAN IND Elmira CAN IND Grays CAN IND Nashua CAN IND New Haven CAN IND New Jersey CAN IND North Shore CAN IND Quebec CAN IND Sussex CAN IND Worcester CAN IND Calgary CBL IND London CBL IND Montreal CBL IND Niagara CBL IND Saskatoon CBL IND Trois-Rivers CBL IND Victoria CBL IND Alexandria CEN IND Amarillo CEN IND Coa Bend CEN IND Edinburg CEN IND El Paso CEN IND Fort Worth CEN IND Jackson CEN IND Ozark CEN IND Pensacola CEN IND Rio Grande CEN IND San Angelo CEN IND Shreveport CEN IND Canton FRO IND Chillicothe FRO IND Cook Cty FRO IND Dubois Cty FRO IND Evansville FRO IND Florence FRO IND Gateway FRO IND Johnstown FRO IND Kalamazoo FRO IND Kenosha FRO IND London FRO IND Mid-MO FRO IND Ohio Valley FRO IND Portsmouth FRO IND Richmond FRO IND River City FRO IND Rockford FRO IND Springfield FRO IND Traverse Cy FRO IND Washington FRO IND Windy City FRO IND Zanesville FRO IND Chico GOL IND Fullerton GOL IND Japan GOL IND Long Beach GOL IND Mesa GOL IND Reno GOL IND San Diego GOL IND Surprise GOL IND Yuma GOL IND Cook Cty HBL IND Dubois Cty HBL IND Lafayette HBL IND Altoona NAL IND Minneapolis NCL IND Aces NEL IND Adirondack NEL IND Albany-Col NEL IND Allentown NEL IND Bangor NEL IND Berkshire NEL IND Brockton NEL IND Catskill NEL IND Elmira NEL IND Mass NEL IND New Haven NEL IND New Jersey NEL IND North Shore NEL IND Quebec NEL IND Waterbury NEL IND Calgary NOR IND Duluth-Sup NOR IND Edmonton NOR IND Fargo-Moor NOR IND Gary NOR IND Joliet NOR IND Kansas City NOR IND Lincoln NOR IND Madison NOR IND Rochester NOR IND Schaumburg NOR IND Sioux City NOR IND Sioux City NOR IND St Paul NOR IND St Paul NOR IND Thunder Bay NOR IND Winnipeg NOR IND Aberdeen PRA IND Brandon PRA IND Minneapolis PRA IND Moose Jaw PRA IND Regina PRA IND Saskatoon PRA IND Baton Rouge SEL IND Houma SEL IND Macon SEL IND Pensacola SEL IND Selma SEL IND Abilene TXL IND Alexandria TXL IND Amarillo TXL IND Corpus Chrs TXL IND Edinburg TXL IND Greenville TXL IND Lafayette TXL IND Lubbock TXL IND Mobile TXL IND Ozark TXL IND Rio Grande TXL IND San Antonio TXL IND Sprng/ozark TXL IND Tyler TXL IND Alexandria UNI IND Amarillo UNI IND Edinburg UNI IND Laredo UNI IND Rio Grande UNI IND San Angelo UNI IND Bend WES IND Chico WES IND Feath River WES IND Grays Harbor WES IND Long Beach WES IND Miss Viejo WES IND Reno WES IND Salinas WES IND Solano WES IND Sonoma Cty WES IND St George WES IND Tri-City WES IND Valley WES IND Yuba-Sutter WES IND Yuma WES IND Zion WES IND Mexico AZM INT Tecate AZM INT Chunichi CL INT Hanshin CL INT Hiroshima CL INT Yakult CL INT Yokohama CL INT Yomiuri CL INT Brother CPB INT China Trust CPB INT Mercury CPB INT President CPB INT Samsung CPB INT Weichuan CPB INT Rimini ITA INT Hiroshima JDS INT Chiba JEL INT Searex JEL INT Seibu JEL INT Yakult JEL INT Yokohama JEL INT Yomiuri JEL INT Hyundai KOR INT Samsung KOR INT Sk KOR INT Aguasc. MEX INT Aguila MEX INT Campeche MEX INT Cancun MEX INT Chetumal MEX INT Cordoba MEX INT Dos Laredos MEX INT Industrials MEX INT Jalisco MEX INT Laguna MEX INT Laredo MEX INT Leon MEX INT MC Reds MEX INT Mexico MEX INT Mexico City MEX INT Minatitlan MEX INT Monterrey MEX INT Oaxaca MEX INT Poza Rica MEX INT Puebla MEX INT Quintna Roo MEX INT Reynosa MEX INT Saltillo MEX INT San Luis Pt MEX INT Tabasco MEX INT Tigres MEX INT Tijuana MEX INT Torreon MEX INT Un. Laguna MEX INT Vaqueros MEX INT Veracruz MEX INT Yucatan MEX INT Chiba PL INT Fukuoka PL INT Kintetsu PL INT Orix PL INT Seibu PL INT Kao-Ping TAI INT Kao-Taichng TAI INT Taipei TAI INT Taipei-Chia TAI INT Taipei TML INT Chunichi WL INT Fukuoka WL INT Hanshin WL INT Hiroshima WL INT Kintetsu WL INT Orix WL INT Surpass WL INT Toyo WL INT Arizona MLB MLB Atlanta MLB MLB Baltimore MLB MLB Boston MLB MLB Chicago MLB MLB Chicago MLB MLB Cincinnati MLB MLB Cleveland MLB MLB Colorado MLB MLB Detroit MLB MLB Florida MLB MLB Houston MLB MLB Kansas City MLB MLB La Angels MLB MLB Los Angeles MLB MLB Milwaukee MLB MLB Minnesota MLB MLB Montreal MLB MLB New York MLB MLB New York MLB MLB Oakland MLB MLB Phladelphia MLB MLB Pittsburgh MLB MLB San Diego MLB MLB San Fran MLB MLB Seattle MLB MLB St.Louis MLB MLB Tampa Bay MLB MLB Texas MLB MLB Toronto MLB MLB Washington MLB MLB Bluefield APP RK Bristol APP RK Burlington APP RK Danville APP RK Elizabethton APP RK Greeneville APP RK Huntington APP RK Johnson City APP RK Kingsport APP RK Martinsvlle APP RK Pikeville APP RK Princeton APP RK Pulaski APP RK Wytheville APP RK Angels AZL RK Athletics AZL RK BoSox/M's AZL RK Brewers AZL RK Cardinals AZL RK Cubs AZL RK Dbacks AZL RK Giants AZL RK Mariners AZL RK Padres AZL RK Rangers AZL RK Rockies AZL RK Rox/Cubs AZL RK Royals AZL RK Royals 2 AZL RK White Sox AZL RK Angels DSL RK Angels DSL RK Angels DSL RK Angels 1 DSL RK Angels 2 DSL RK A's 2 DSL RK A's East DSL RK A's West DSL RK Astros DSL RK Astros/BoSox DSL RK Astros/Brew DSL RK Athletics DSL RK Athletics DSL RK Blue Jays DSL RK Blue Jays 2 DSL RK Blue Jays E DSL RK Braves DSL RK Braves 2 DSL RK Brew/ChiSox DSL RK Brewers DSL RK Cardinals DSL RK Co-Op DSL RK Cubs DSL RK Cubs/Padres DSL RK Cubs/Rangers DSL RK Dbacks DSL RK Dbacks/Exp DSL RK Devil Rays DSL RK Dodgers DSL RK Dodgers E DSL RK Dodgers LP DSL RK Dodgers N DSL RK Dodgers W DSL RK Dodgers/Pads DSL RK Dodg-Rom DSL RK Expos DSL RK Giants DSL RK Giants/O's DSL RK Indians DSL RK Indians 2 DSL RK Indians A DSL RK Indians B DSL RK Indians C DSL RK Indians W DSL RK Indians/Rsox DSL RK La-Romano DSL RK La-S.Doming DSL RK Mariners DSL RK Marlins DSL RK Mets DSL RK Mets 2 DSL RK Mets E DSL RK Mets E DSL RK Mets W DSL RK Mets W DSL RK Nationals DSL RK Nationals 2 DSL RK Orioles DSL RK O's/ChiSox DSL RK Padres DSL RK Pads/Jays DSL RK Phillies DSL RK Phils/Cards DSL RK Phils/Cards DSL RK Pirates DSL RK Rangers DSL RK Rays/Angels DSL RK Red Sox DSL RK Red Sox E DSL RK Red Sox N DSL RK Reds DSL RK Rockies DSL RK Royals DSL RK Royals/Cubs DSL RK Royals/Rox DSL RK SD Rangers DSL RK SP Angels DSL RK SP Astros DSL RK SP Braves DSL RK SP Giants DSL RK SP Orioles DSL RK SP Red Sox DSL RK Tigers DSL RK Tigers/Cards DSL RK Twins DSL RK White Sox DSL RK Yankees DSL RK Yankees 2 DSL RK Yankees E DSL RK Yankees W DSL RK Yanks/Mets DSL RK Yanks/Pads DSL RK Astros GCL RK Blue Jays GCL RK Brad Jays GCL RK Braves GCL RK Cubs GCL RK Devil Rays GCL RK Dodgers GCL RK Expos GCL RK Indians GCL RK Marlins GCL RK Mets GCL RK Nationals GCL RK Orioles GCL RK Phillies GCL RK Pirates GCL RK Rangers GCL RK Red Sox GCL RK Reds GCL RK Royals GCL RK Tigers GCL RK Twins GCL RK White Sox GCL RK Yankees GCL RK Billings PIO RK Butte PIO RK Casper PIO RK Great Falls PIO RK Helena PIO RK Idaho Falls PIO RK Lethbridge PIO RK Med Hat PIO RK Missoula PIO RK Ogden PIO RK Orem PIO RK Pocatello PIO RK Provo PIO RK Aguirre VZL RK Alianza VZL RK Astros VZL RK Cabudare VZL RK Cagua VZL RK Cardinals VZL RK Carora VZL RK Chino VZL RK Chivacoa VZL RK Ciu Alianza VZL RK Ciudad VZL RK Cocorote VZL RK Guacara-1 VZL RK Guacara-2 VZL RK La Pradera VZL RK La Victoria VZL RK Maracay 2 VZL RK Maracay-1 VZL RK Mariara VZL RK Mariners VZL RK Mets VZL RK Miranda VZL RK Montalban VZL RK O's/ChiSox VZL RK Phillies VZL RK Pirates VZL RK Pt Cabello VZL RK Reds VZL RK S Joaquin 2 VZL RK San Felipe VZL RK San Joaquin VZL RK Tigers/Marlins VZL RK Tronconero1 VZL RK Tronconero2 VZL RK Twins/Jays VZL RK Universidad VZL RK Venoco VZL RK Venoco 2 VZL RK Yaritagua VZL RK Bellingham NWL SS Bend NWL SS Boise NWL SS Central Ore NWL SS Eugene NWL SS Everett NWL SS Medford NWL SS Portland NWL SS Salem NWL SS Sou Oregon NWL SS Spokane NWL SS Tri-City NWL SS Vancouver NWL SS Yakima NWL SS Aberdeen NYP SS Auburn NYP SS Batavia NYP SS Brooklyn NYP SS Elmira NYP SS Erie NYP SS Geneva NYP SS Glens Falls NYP SS Hamilton NYP SS Hudson Val NYP SS Jamestown NYP SS Lowell NYP SS Mahoning NYP SS New Jersey NYP SS Newark NYP SS Niagara Fls NYP SS Oneonta NYP SS Pittsfield NYP SS Queens NYP SS St Cath NYP SS St College NYP SS Staten Is NYP SS Tri-City NYP SS Utica NYP SS Vermont NYP SS Watertown NYP SS Welland NYP SS Williamsprt NYP SS