State-by-State Covid-19 Travel Guide (as of January)

Below is a state-by-state guide of travel restrictions in the United States:

Alabama -->

Must take a qualifying negative COVID-19 test within 72 hours of departure
Then submit results and fill out their Travel Declaration and Self-Isolation Plan through the Portal.
If you didn't get tested before traveling, you must pay $250 upon arrival and quarantine until results come in (at your own expense)

There is a regional stay-at-home order
Non-essential travel throughout the state except in a region north of Sonoma County is banned.
The Governor restricted hotel stays for leisure travel and other business activity in affected areas (more info here)
It is recommended that visitors from out of state should self-quarantine for 14-days.
San Francisco has ordered a mandatory10-day quarantine for travelers coming from outside the nine-county Bay Area region.
Los Angeles County: out of state visitors over the age of 16 must fill out a Traveler Form. Failure to submit this form prior to or upon arrival at Los Angeles International Airport, Van Nuys Airport, or Union Station is punishable by a fine of up to $500.

Colorado doesn't have travel restrictions, however, Pitkin County set their own rules.
Pitkin County (includes ski resort Aspen/Snowmass) require anyone spending one or more nights in the area to fill out a Pitkin County Traveler Affidavit. They also require anyone 10 and over to have a negative Covid-19 test taken within 72-hours of arrival.

Anyone entering the state (besides New York, New Jersey, and Rhode Island) must quarantine for 10-days and complete the Connecticut Travel Health Form. Failure to submit or quarantine could result in $500 fine per violation.

Hawaii gets tricky and rules are ever changing so please be sure to check on the Hawaii website too

If you wanna bypass the 10-day mandatory quarantine, you must take a Covid-19 test within 72-hours before departure.
Hawaii only accepts the Nucleic Acid Amplification Test (NAAT) from a certified Clinical Laboratory Improvement Amendment (CLIA) lab test results from a Trusted Testing Partner.
Travelers must submit their negative test results to the Safe Travels Digital Platform.
At least 25% of travelers who use the Pre-Travel Testing option will also be randomly selected to receive a non-optional second test upon arrival at the airport, free of charge
If you don't comply with quarantine or approved testing requirements, you'll be fined up to $5000 or a year in prison.

No statewide travel restrictions in Illinois as of 1/14
As of 1/15, Chicago issued a Travel Order that applies to anyone coming into the City from designated states with a significant degree of community-wide spread. States are categorized as Yellow or Orange.
Anyone traveling from a state on the Orange list is directed to obtain a negative COVID-19 test result no more than 72 hours prior to arrival in Chicago or quarantine for a 10-day period.

No statewide travel restrictions in Iowa as of 1/14
Anyone 2 and older is required to wear a mask when in indoor spaces or state government buildings,

Visitors who have been on a cruise or attended a mass gathering event (500 ppl+) must quarantine for 7-10 upon arrival.
Those who receive a negative result after testing on their sixth day will be released from quarantine on Day eight, instead of Day 11.

Travelers must quarantine for 10-days upon arrival or produce negative Covid-19 test results taken no longer than 72-hours (PCR and Antigen tests are accepted).
Visitors will need to fill out a Certificate of Compliance Form indicating you received a negative test result.
You may also get tested upon arriving in Maine but must quarantine while awaiting results.