Companies across the US are offering workers perks for getting the COVID-19 vaccine. Here's the running list.

• Workers across the US can receive extra pay from their employers for receiving the COVID-19 vaccine.
• Many front-line workers are now able to receive the vaccine in various states and localities.
• So far, almost 34 million people have received one or more doses of the two-shot immunization.

Companies across the US are joining in the largest-ever vaccination effort by offering employees perks if they receive the two-dose COVID-19 vaccine.

Receiving the vaccine is voluntary, but most companies have strongly encouraged employees get the immunization when it's their turn. The two-dose vaccines, one from Pfizer and BioNtech and the other from Moderna, were emergency approved in the US in December. Since then, almost 34 million people have received one or more doses, according to data from the Centers for Disease Control and Prevention.

Many states and localities have begun moving from the first phase of vaccinating health care workers and elderly living in long-term care facilities to immunizing front-line workers. With that, some companies are giving workers two to three hours of paid time off per dose received, and others are offering a stipend for employees who voluntarily get the shots when it's their turn.

Recently, Publix, Petco and AT&T joined the growing list. Here's the 18 Insider knows about so far:

Know of a company not on this list that's offering employees time off, pay, or other perks to get vaccinated? Email Natasha, the reporter of this piece, at ndailey@insider.com.

1. Target

Target is offering workers up to four hours of paid time off to get both shots of the vaccine and will pay for Lyft rides up to $15 for employees needing transportation to and from their appointment.

2. Dollar General

The discount chain was the first major retailer to announce an incentive for workers to get vaccinated. Dollar General employees can earn up to four hours of pay for receiving both doses of the COVID-19 vaccine and will receive extra time off if they have an adverse reaction.

Read more: What's coming next for COVID-19 vaccines? Here's the latest on 11 leading programs.

3. Darden Restaurants

Darden Restaurants, which owns Olive Garden, LongHorn Steakhouse, Bahama Breeze, and The Capital Grille, will offer workers four hours of paid time off, two hours per dose, Bloomberg reported. Employees must show proof of their vaccination to earn the time. The company doesn't require the shots, but strongly encouraged workers to get them.

4. Shake Shack

The burger-and-shake restaurant chain will give workers 3 hours of pay per shot of the two-dose vaccine. Shake Shack didn't mandate employees receive the vaccine but "strongly encouraged" it.

5. Noodles & Company

Workers will earn up to four hours of paid time off for receiving the vaccine, the company said in a Feb. 10 statement to Insider. The restaurant strongly recommended employees receive the vaccine but did not require it.

6. Kroger

The grocer is giving employees a one-time $100 payment for getting the vaccine. On top of that, Kroger said it would give associates an added bonus of a $100 store card and 1,000 fuel points to "thank and reward" workers during the pandemic.

7. Trader Joe's

The grocery retailer will offer all 50,000 employees two hours of pay per dose and allow for flexible scheduling so workers can make it to appointments.

8. Aldi

The German grocer will cover employee costs associated with receiving the vaccine and provide two hours of pay for each of the two doses received.

9. Instacart

The app will offer its US and Canada shoppers, who deliver groceries to customers, a $25 stipend to get vaccinated.

10. Lidl

The German grocery chain is encouraging workers to get vaccinated by offering its US workers $200 in extra pay if they receive the immunization.

11. McDonald's

The fast food chain is giving workers four hours of pay for receiving the vaccine. Though getting the shots is not required, the company said it will connect employees with groups that can answer questions on the vaccination, Restaurant Business reported.

12. Starbucks

The coffee chain is offering workers two hours of pay per dose of the COVID-19 vaccine they receive.

13. Chobani

Chobani will give workers up to six hours of pay, three per dose, for receiving the vaccine, Human Resource Executive reported.

14. Amtrak

Amtrak is allowing employees to get vaccinated during work hours, and will pay for two hours off if employees provide proof they received the shot. Workers will also be excused with pay for up to 48 hours if they have side effects.

15. JBS USA and Pilgrim's

The meat-packing company is offering employees a $100 bonus incentive if they receive the vaccine voluntarily.

16. Petco

The pet-supply retailer told Insider it would offer employees a one-time payment of $75 for getting vaccinated. Plus, it will give a $25 donation to the Petco Partner Assistance Fund for each person who receives their shots.

17. AT&T

AT&T is giving employees up to four hours of paid time off per dose, adding up to eight hours total for anyone who needs the hours to get the vaccine, a spokesperson said in an email to Insider. The company is also giving workers access to Castlight, a tool to help them find available vaccines in their area based on eligibility.

18. Publix

Publix will give associates a $125 gift card to the store after they get both doses of a COVID-19 vaccine. Workers aren't required to get the shots at Publix, but they will need to show proof of vaccination. The vaccine is optional, though encouraged, the company said.

19. Walmart and Sam's Club

Beginning May 18, Walmart and Sam's Club will give its associates below the store manager level $75 for being fully vaccinated, the companies announced on May 14. Workers are required to show their vaccine card in order to receive this bonus.