Here you go.
Part one.
State laws
Each individual state (and sometimes individual counties, cities, and towns) may, and often do, have laws restricting weapons including knives, often specifically mentioning switchblades. Laws often refer to blade lengths and styles to define tools with useful purposes. The definition of a legal knife is often taken in context with the situation. Some states allow police officers to declare any object, screwdriver or broken bottle as an offensive weapon.
U.S. state laws regarding possession, concealed and non-concealed carry
State--------------------------------Possession----------------------------Carry
Alabama Legal - State Code: Title 13A Criminal Code Legal - Allowed if not concealed - State Code: Section 13A-11-50
Alaska Illegal - State Code: Article 2, Section 11.61.200 Illegal - State Code: Article 2, Section 11.61.200
Arizona Legal - State Code: Arizona Criminal Code 13-3102 Legal[15] - State Code: 13-3102 A-1
Arkansas Legal - State Code: 5-73-120 Legal as long as intent is not to use the knife as a weapon against a person. If the intent is to use it as a weapon on a person, then it is illegal to carry, especially where alcohol is served or present. State Code: 5-73-120
California Legal - Allowed if blade is under 2 inches - State Code: California Penal Code 653k Legal - Allowed if blade is under 2 inches - State Code: California Penal Code 12020
Colorado Illegal - State Code: Criminal Code Section 18-12-101 Illegal - State Code: Criminal Code Section 18-12-101
Connecticut Legal - State Code: Sec. 53-206'' Legal - Allowed if blade is under 1.5 inches - State Code: Sec. 53-206
Delaware Illegal - State Code: Crimes & Criminal Procedure - Chapter 11 Section 222 Illegal - State Code: Chapter 11 Section 222
Florida Legal - State Code: 790.001 Allowed if not concealed. Concealed carry allowed with permit - State Code: 790.001
Georgia Legal - State Code: 16-11-126 Legal - if carried openly State Code: 16-11-126
Hawaii Illegal - State Code: §134-51 Illegal - State Code: §134-51
Idaho Legal - State Code: 18-3302 Legal Allowed, but illegal if intoxicated or exhibiting any deadly or dangerous weapon in a rude, angry or threatening manner - State Code: 18-3302
Illinois Illegal - State Code: Criminal Code 720 ILCS 5/24-1 Illegal - State Code:720 ILCS 5/24-1
Indiana Illegal - State Code: IC 35-47-5-2 Sec.2.(2) Illegal - State Code: IC 35-47-5-2 Sec.2.(2)
Iowa Legal - State Code: Crime Control and Criminal Acts - Definitions. 702.7 Legal - if not concealed - State Code: 724.4
Kansas Illegal - State Code: Article 42. Crimes Against the Public Safety Weapons Control. Section 21-4201 Illegal - State Code: Section 21-4201