These are the states requiring people to wear masks when out in public

Updated 6:06 PM ET, Thu July 2, 2020

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(CNN)A growing number of US states have mandated the use of masks and face coverings while in public.

With many states starting to lift coronavirus restrictions, more people are venturing out in public, but the number of cases is still rising in nearly half of them.
That's where masks come in. A recent study found that the use of masks and face coverings has been the most effective way to reduce person-to-person spread of coronavirus.
Here are the states that require the use of masks or face coverings in public settings.

California

As of June 18:
    California Gov. Gavin Newsom issued a statewide order on Thursday requiring the use of face coverings in public indoor spaces, including while shopping, riding on public transportation or seeking medical care.
    Newsom's order also mandated the use of masks or face coverings in public outdoor spaces when social distancing is not an option. There was no guidance on how the order will be enforced or if violators will face any penalties or citations.

    Connecticut

    As of April 20:
    Connecticut's mask requirement applies to any resident over the age of 2 in a public space where social distancing isn't possible. The rules also apply to individuals using public transportation, taxis or rideshare services.
    The state's Department of Economic and Community Development also released mask guidelines for essential workers:
    Employees at essential businesses must wear masks or any other material covering their mouth and nose at all times while at work. Employers must provide masks or the materials to make them. All customers under age 2 must wear them, too.
    People who refuse to wear masks aren't required to provide proof that they're medically exempt.

    Delaware

    As of April 28:
      Delaware Gov. John Carney ordered residents to wear face masks while in public, including at grocery and convenience stores, pharmacies, doctor's offices and on public transportation.
      Children under the age of 12 are not required to wear face coverings, and those age 2 and under must not wear face masks due to the risk of suffocation.

      District of Columbia

      As of May 16:
      District of Columbia Mayor Muriel Bowser ordered the use of masks or face coverings when conducting essential business or travel and social distancing isn't possible.
      Masks or other face coverings are required in grocery stores, pharmacies and takeout restaurants. On public transportation, face coverings are required if individuals are unable to be six feet apart.
      Children between the ages of 2 and 9 are advised to wear masks.

      Hawaii

      As of April 20:
      Both customers and employees at essential businesses are required to wear cloth face coverings. Establishments must limit the number of customers allowed in and keep them six feet apart.
        Anyone who violates those rules could face a fine of up to $5,000, or up to a year in prison if found guilty, according to Hawaii Gov. David Ige's order.

        Illinois

        As of May 1:
        Illinois Gov. JB Pritzker ordered the use of face masks for anyone stepping outside their house.
        Face coverings are required while shopping at essential businesses, traveling on public transportation, picking up food, or visiting the doctor and it's impossible to stay six feet apart.

        Kansas

        As of July 3:
        An executive order was issued by Kansas Gov. Laura Kelly mandating face masks must be worn statewide in public spaces.
        Kelly, commenting on Facebook Monday, wrote, "Starting July 3, I will issue an Executive Order requiring marks be worn in indoor public spaces, and at any outdoor gathering in which social distancing cannot be maintained. This step will keep Kansans healthy, and keep Kansas open for business."

        Kentucky

        As of May 11:
          Kentucky Gov. Andy Beshear ordered all state residents to wear face masks in public.
          Gov. Beshear has said that people will not be fined or arrested for not wearing a mask in public, but the order gives businesses the right to turn away any customer not wearing a face covering.

          Maine

          As of May 1:
          Maine Gov. Janet Mills issued an order requiring face coverings or masks for anyone over the age of 2 in indoor public spaces such as supermarkets, retail stores, pharmacies and doctor's offices.

          Maryland

          As of April 18:
          Commuters must wear face coverings while using Maryland's public transit, according to Gov. Larry Hogan's order.
          Employees of essential businesses and customers over the age 9 must wear face coverings. Adults accompanying young children should make an effort to get them to wear a mask.

          Massachusetts

          As of May 6:
          Massachusetts Gov. Charlie Baker issued an order requiring the use of face coverings or masks in both indoor and outdoor spaces where social distancing isn't possible.
          Children under the age of 2 do not have to adhere to this order.