Maricopa County Covid-19 Vaccine Data

Key takeaways from this week’s data (as of 2/23/2021)

  • Over 633,000 (over 18%) of all Maricopa County adult residents have been vaccinated with at least one dose of COVID-19 vaccine. That is more than an additional 100,000 people who have received at least one dose of vaccine since last week.
  • Almost 260,000 Maricopa County residents, or 40% who have received at least one dose, have been fully vaccinated with 2 doses of vaccine.
  • In the last week, Maricopa County residents have received an average of almost 23,000 doses of vaccine per day.
  • More than half of those vaccinated in Maricopa County are 65 years or older.
  • 44% of residents aged 65-74 in Maricopa County have already received at least one dose of vaccine.
  • 61% of residents who are 75 or older in Maricopa County have been vaccinated.


Data updated every Wednesday at 12 p.m. 


Maricopa Vaccine Allocation and Administration

The Arizona Department of Health Services is now managing all Pfizer vaccine allocated to Maricopa County Points of Distribution (PODs). The data regarding the proportion of vaccine allocated that has gone into arms is no longer relevant. Please visit the ADHS Vaccine Data Dashboard for state data.  

Vaccine Doses Received by Maricopa County Residents

Maricopa County residents receive COVID-19 vaccine from a variety of administration sites, which can be allocated vaccine by county, state, or federal governments. 

These data reflect the number of COVID-19 vaccine doses that have been given to Maricopa County residents (based on residential address), regardless of which site they received the vaccine (includes doses given at the State Farm and Phoenix Municipal Stadium PODs.) 

Data source: 

  • Maricopa County resident vaccine data: Arizona State Immunization Information System (ASIIS) via ADHS 

Maricopa County Residents Vaccinated with ≥1 Dose of COVID-19 Vaccine 

Maricopa County residents receive COVID-19 vaccine at different vaccine administration sites, which can be allocated vaccine by county, state, or federal governments. 

These data reflect the number of Maricopa County residents (based on residential address) who have received ≥1 dose of COVID-19 vaccine, regardless of which site at which they were vaccinated. 

Each table shows the demographics of the Maricopa County residents who received vaccine by sex, age, race, and ethnicity. 

  • Number of Maricopa Residents Who Are Vaccinated with ≥1 Dose (dark blue bars): 
    • Number of Maricopa residents in each category who have received ≥1 vaccine dose 
    • Column 1 calculation = # of Maricopa residents in one category (e.g., female) who have received ≥1 dose
  • Percent of All Maricopa Residents Who Are Vaccinated with ≥1 Dose (light blue bars): 
    • Percent of all Maricopa residents who have received ≥1 vaccine dose who fall into each demographic category (e.g., sex, age group, race, ethnicity) 
    • Column 2 % calculation = # of Maricopa residents in one category (e.g., female) who have received ≥1 dose / all Maricopa residents who have received ≥1 dose x 100
  • Percent of All Maricopa Residents of Each Demographic Category (teal bars):
    • Percent of all Maricopa residents who fall in a demographic category (e.g., sex, age group, race, ethnicity) who have received ≥1 vaccine dose 
    • Column 3 % calculation = # of Maricopa residents in one category (e.g., female) who have received ≥1 dose / all Maricopa residents in that category (e.g., female) x 100


Data sources: 

Map of Maricopa County Residents Vaccinated with ≥1 Dose of COVID-19 Vaccine

The percent and rate (per 100,000 persons) of eligible Maricopa County residents (based on residential address) who have received COVID-19 vaccine are mapped by ZIP code and city of residence.

The total eligible population to receive COVID-19 vaccine is based on which phase Maricopa County is vaccinating (e.g., Phase 1A, Phase 1B, etc.), and calculated using Census 2020 estimates. As of February 10th, the eligible population for figures shown in the map below includes Phase 1A (healthcare workers, EMS workers, LTCF staff and residents), Phase 1B Priority (75+, K-12 school staff and childcare workers, law enforcement/protective services), and 65+. People 65+ are included in this eligible population denominator in anticipation of opening vaccine to this population very shortly in Maricopa County and to include those who were vaccinated at State-operated sites.

Data sources:

  • Maricopa County resident vaccine data: Arizona State Immunization Information System (ASIIS) via ADHS 
  • Vaccine-Eligible Maricopa County population: Census 2020 estimates calculated by the geographic information system (GIS) software company, Esri

Frequently Asked Questions

Vaccine administration sites are locations where a COVID vaccine-eligible person can be vaccinated. They include large sites such as the County- and State-operated PODs (points of dispensing), and smaller sites such as pharmacies and healthcare clinics. All vaccine administration sites can be found at the MCDPH Vaccine Location and ADHS Vaccine Finder websites.



The Arizona State Immunization Information System (ASIIS) is a state-owned database that tracks all vaccines given in Arizona, including the COVID-19 vaccine. All states have vaccine databases. Healthcare providers and other vaccine administrators are required to report all vaccines given to persons in who live in Arizona.

For the COVID-19 vaccine, some ASIIS data come from when a person registers for the vaccine (e.g., residential address, sex, race, ethnicity) and some ASIIS data come from the vaccine administrators (e.g., dose number, vaccine administration site).

MCDPH is given ASIIS data from ADHS, which includes information about Maricopa County residents who have received COVID-19 vaccine.



MCDPH reports data on vaccine doses allocated to Maricopa County vaccine administration sites and on Maricopa County residents who have received at least one dose of vaccine. MCDPH identifies Maricopa County residents by residential address.

ADHS reports data based on the county in which a person receives their vaccine.



Allocated vaccine doses have been assigned and delivered to Maricopa County vaccine administration sites by ADHS.

Administered vaccine doses are those that have been given, or put into arms, at Maricopa County vaccine administration sites.



COVID-19 vaccine is allocated to ADHS by the federal government each week. Then, vaccine is allocated from the state to Maricopa County administration sites on a weekly basis, once ADHS knows how much vaccine will be coming to Arizona. In other words, there is almost always some amount of COVID-19 vaccine that is in-transit from the manufacturer to the state and onto the county administration sites.

Maricopa County vaccine administration sites typically receive vaccine about 1 week after it is allocated. We try to open only the number of appointments for which we are sure we have vaccine available, however the state has assured us that they will make sure we have vaccine for scheduled appointments. The number of vaccines we get is constantly changing from week to week.



If a field is missing in the data, it is marked as unknown. For example, if a Maricopa County resident registered to receive the COVID-19 vaccine and forgot to mark their birthday or race, it will be counted as “unknown.” If a person at the vaccine administration site did not fill in the dose number being received, then it will be marked as “unknown.”



When a person registers to receive a COVID-19 vaccine, they are prompted to fill in their race. This menu includes an option for “other,” in the event that a person does not identify with any of the listed races. A person who selects “other” will be included in this category in the race data.



Demographic data such as sex, race, and ethnicity are often limited by the data system being used. In this case, the options available in ASIIS for sex are limited to male and female, and do not allow people to select a different sex with which they might identify.

Similar limitations exist in population-level data, such as Census data, which are used to understand how many total people fall into different demographic categories. For example, we do not have total population data for Maricopa County residents who are non-binary or identify as something other than male or female. These limitations are something Public Health is aware of.



Race data are typically obtained when a person registers to receive a COVID vaccine and selects one or more race(s) with which they identify. A limitation of our population-level data (e.g., Census data) is that we only know total Maricopa County population numbers based on one race that a person identifies as.

People who identified as more than one race are counted in the race that has the smaller population in Maricopa County. For example, if someone marked both African American/Black and White in their vaccine registration data, they will be counted as African American/Black in the vaccine data.

We know different populations may face greater challenges getting COVID-19 vaccine. We want to be sure we use data like race to understand gaps in vaccination rates so we can appropriately target outreach to improve vaccine uptake.



Population-level data, such as Census data or ADHS Population Denominators, are not available for populations that are marked as “other” or are unknown. Because we do not know the total number of people who fall into these categories in Maricopa County, we cannot calculate the percent of these populations that have received COVID-19 vaccine.



All vaccine data from the Arizona State Immunization Information System for Maricopa County residents are based on the residential address submitted by the person during the vaccine registration process. These persons are considered to be Maricopa County residents at the time of vaccination, and are eligible to receive COVID-19 vaccine in Maricopa County.

People who do not live in Maricopa County year-round may not be included in Maricopa County population-level data, such as the Census or ADHS Population Denominators, because these data are based on where a person lives most of the time. This might cause some populations to have a higher percentage of the population having received COVID-19 vaccine. In other words, a person living in Maricopa County in the winter who received COVID-19 vaccine will be counted as a vaccinated Maricopa County resident, however that person might not be counted in the total population used to calculate the percent of the population vaccinated if they don’t live in Maricopa County year-round.

Because Maricopa County’s population grows during the winter every year, these are trends we see in many types of data.



There are two main reasons this occurs: 

  • Some vaccine administrators (e.g., Indian Health Services, other federal entities) receive COVID-19 vaccine allocated directly from the federal government and are not required to follow Maricopa County’s vaccine priority schedule. MCDPH calculates the percent of the vaccine-eligible population who has received ≥1 dose of COVID-19 by geographic area based on the Maricopa County vaccine phase. If people who fall outside of the Maricopa County vaccine-eligible phase are vaccinated, it can appear that >100% of that population has been vaccinated. 
  • People who do not live in Maricopa County year-round may not be included in Maricopa County population-level data, such as the Census or ADHS Population Denominators, because these data are based on where a person lives most of the time. This might cause some populations to have a higher percentage of the population having received COVID-19 vaccine. In other words, a person living in Maricopa County in the winter who received COVID-19 vaccine will be counted as a vaccinated Maricopa County resident, however that person might not be counted in the total population used to calculate the percent of the population vaccinated if they don’t live in Maricopa County year-round. 


Data files from past weeks’ reports can be found and downloaded at the County’s open data webpage.



The Maricopa County vaccine-eligible population for each ZIP code and city is determined using 2020 U.S. Census estimates calculated by the geographic information system (GIS) software company, Esri. Additional information about Esri’s methodology can be found on their website:


back to top