Firearm regulations vary from state to state, or even by city or county. Below is a compiled list of sites for each state that can be used as references to learn about those regulations.
Alabama
State Firearm Policies:
https://www.alea.gov/gun-laws
Alaska
Permits and Licensing:
http://dps.alaska.gov/statewide/PermitsLicensing/concealedhandguns.aspx
Arizona
Concealed Weapons:
https://www.azdps.gov/services/public/cwp
Arkansas
Concealed Handguns Licensing:
http://asp.arkansas.gov/services-and-programs/detail/concealed-handgun-licensing
California
Firearms Division:
https://oag.ca.gov/firearms
Colorado
Gun Laws:
https://www.colorado.gov/pacific/csp/colorado-gun-laws
Connecticut
Firearms Division:
http://www.ct.gov/bfpe/site/default.asp
Delaware
Concealed Weapons Reciprocity:
https://attorneygeneral.delaware.gov/criminal/concealed-carry-deadly-weapons-ccdw/
Florida
Concealed Weapon License:
https://www.fdacs.gov/Consumer-Resources/Concealed-Weapon-License
Georgia
Firearms Licensing:
https://georgia.gov/apply-firearms-license
Hawaii
Gun Laws:
http://www.honolulupd.org/information/index.php?page=gunmain
Idaho
Statutes:
https://www.idaho.gov/laws-public-safety/gun-weapon-law/
Illinois
Firearms Services Bureau:
https://www.ispfsb.com/
Indiana
Firearms Licensing:
https://www.in.gov/isp/firearms.htm
Iowa
Weapons Permits:
https://dps.iowa.gov/divisions/administrative-services/weapons-permit
Kansas
Facts:
https://ag.ks.gov/licensing/concealed-carry
Kentucky
Qualifications for a CCDW License:
https://wp.kentuckystatepolice.ky.gov/ccdw/ccdw-home/
Louisiana
Statutes:
https://www.wlf.louisiana.gov/
Maine
Statutes:
https://www.maine.gov/dps/msp/licenses-permits/concealed-carry-maine
Maryland
Licensing:
http://www.mdsp.org/
Massachusetts
Firearms Records Bureau:
https://www.mass.gov/service-details/gun-ownership-in-massachusetts
Michigan
Firearm FAQs:
https://www.michigan.gov/msp/0,4643,7-123-1878_1591_3503_4654—-,00.html
Minnesota
Statutes:
https://www.house.leg.state.mn.us/hrd/pubs/firearms.pdf
Mississippi
Firearms Permits and Laws:
https://www.driverservicebureau.dps.ms.gov/Firearms/Home
Missouri
Concealed Carry Reciprocity:
https://ago.mo.gov/criminal-division/public-safety/concealed-carry-reciprocity
Montana
Concealed Weapons:
https://doj.mt.gov/enforcement/concealed-weapons/
Nebraska
Concealed Carry:
https://statepatrol.nebraska.gov/services/concealed-handgun-permits
Nevada
Statutes:
http://www.leg.state.nv.us/NRS/NRS-202.html#NRS202Sec253
New Hampshire
Permits:
https://www.nhsp.dos.nh.gov/our-services/justice-information-bureau/permits-and-licensing
New Jersey
FAQs, Reciprocity, and Firearms Restrictions:
http://www.njsp.org/firearms/index.shtml
Firearms Forms:
http://www.njsp.org/information/forms.shtml
New Mexico
Concealed Weapons:
https://www.dps.nm.gov/index.php/top-links-for-nm-residents/concealed-carry-licenses
New York
Permits:
http://troopers.ny.gov/firearms/
North Carolina
Permit FAQs:
https://ncdoj.gov/law-enforcement-training/law-enforcement-liason/concealed-weapon-reciprocity/
North Dakota
Concealed Weapons:
https://attorneygeneral.nd.gov/public-safety/constitutional-concealed-carry
Ohio
Handgun Permits and Licensing:
https://www.ohioattorneygeneral.gov/Law-Enforcement/Concealed-Carry
Oklahoma
Handgun Permits and Licensing:
http://www.ok.gov/osbi/Handgun_Licensing/index.html
Oregon
Firearms Instant Check System (FICS):
http://www.oregon.gov/osp/id/pages/fics.aspx
Pennsylvania
Reciprocity:
https://www.attorneygeneral.gov/Media_and_Resources/Firearm_Reciprocity_Agreements/
Rhode Island
Policy, Application, and Relevant Statutes:
https://riag.ri.gov/what-we-do/bureau-criminal-identification-bci/pistol-permits
South Carolina
Firearms Laws:
https://www.sled.sc.gov/regulatory.html#cwp
South Dakota
Pistol Permits:
https://sdsos.gov/general-services/concealed-pistol-permits/cc-default.aspx
Tennessee
Handgun Carry Permits:
https://www.tn.gov/safety/tnhp/handgun.html
Texas
Concealed Handgun License Program:
https://txapps.texas.gov/txapp/txdps/ltc/
Utah
Statutes:
http://bci.utah.gov/concealed-firearm/how-do-i-apply-for-a-concealed-firearm-permit/
Vermont
Laws:
http://ago.vermont.gov/about-the-attorney-generals-office/divisions/criminal-justice/gun-laws/
Virginia
General Info, Laws, Purchases, and Reciprocity:
https://vsp.virginia.gov/services/firearms/resident-concealed-handgun-permits/
Washington
Concealed Weapon Reciprocity:
http://www.atg.wa.gov/firearms
West Virginia
Weapons FAQs:
https://ago.wv.gov/gunreciprocity/Documents/Firearms%20Handbook%20.pdf
Wisconsin
Firearms Laws:
http://wilawlibrary.gov/topics/firearms.php
Concealed Carry:
https://concealedcarry.doj.wi.gov/ccwonline/index.html#
Wyoming
Concealed Weapons Info and Reciprocity:
https://wyomingdci.wyo.gov/criminal-justice-information-services-cjis/concealed-firearm-permits