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Immunization Information Systems (IIS)








2021 IISAR Data Participation Rates										Related Pages
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			2021 Child Participation2021 Adolescent Participation2021 Adult Participation
		
Child, adolescent, and adult participation rates in IIS are reported for the 2020 IISAR to monitor progress toward Healthy People 2020 objectives and program initiatives. For a discussion on the calculation and reporting of provider site participation rates in IIS, please see the 2012 Immunization Information System progress report in Morbidity and Mortality Weekly Report.
2021 CHILD Participation Table and Map
Percentage of U.S. Children < 6 years with 2+ Immunizations in IIS
Percentage of children aged <6 years participating in an immunization information system (IIS) in the United States (including all 50 states, five cities, and the District of Columbia, and eight territories) in 2021.
National coverage: 98% (excluding territories)
Map of this data (printable version) [1 page]
CHILD Participation Table
State/City
Percentage**Alabama**
81.0%**Alaska**
76.9%**Arizona**
103.8%**Arkansas**
101.7%**California**
97.6%**Chicago, IL**
100.1%**Colorado**
105.1%**Connecticut**
95.9%**DC**
91.4%**Delaware**
104.0%**Florida**
91.2%**Georgia**
104.2%**Hawaii**
63.3%**Houston, TX**
143.6%**Idaho**
95.3%**Illinois***
95.1%**Indiana**
98.7%**Iowa**
101.4%**Kansas**
90.0%**Kentucky**
98.6%**Louisiana**
105.9%**Maine**
98.4%**Maryland**
98.5%**Massachusetts**
106.0%**Michigan**
96.3%**Minnesota**
96.7%**Mississippi**
105.5%**Missouri**
81.6%**Montana**
94.6%**Nebraska**
96.3%**Nevada**
101.0%**New Hampshire**
37.1%**New Jersey**
94.4%**New Mexico**
100.7%**New York***
100.4%**New York City, NY**
100.7%**North Carolina**
103.8%**North Dakota**
95.9%**Ohio**
93.8%**Oklahoma**
91.3%**Oregon**
98.7%**Pennsylvania***
89.6%**Philadelphia, PA**
108.0%**Rhode Island**
100.0%**San Antonio, TX**
95.1%**South Carolina**
107.2%**South Dakota**
97.5%**Tennessee**
99.2%**Texas***
101.9%**Utah**
101.5%**Vermont**
102.1%**Virginia**
104.9%**Washington**
99.5%**West Virginia**
94.5%**Wisconsin**
97.1%**Wyoming**
103.7%
Show More
CHILD Participation Table 2
Territories
Percentage**American Samoa**
116.5%**Guam**
43.6%**Marshall Islands**
63.1%**Federated States of Micronesia**
106.8%**Northern Mariana Islands**
89.0%**Palau**
17.5%**Puerto Rico**
90.0%**Virgin Islands**
60.4%
Show More
Footnotes
* City-based IIS participation rates are reported separately from their respective states; state rates do not include city data in their values.
Reported annual fluctuations in child participation may be due to programmatic and/or technical changes to the immunization information system. The denominator used to calculate child participation numbers are drawn from the 2021 Census estimates for each state and city.
Source: Immunization Information System Annual Report, CY2021
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2021 ADOLESCENT Participation Table and Map
Percentage of U.S. Adolescents 11-17 years with 2+ Adolescent Immunizations in IIS
Percentage of adolescents aged 11-17 years participating in an immunization information system (IIS) in the United States (including all 50 states, five cities, and the District of Columbia, and eight territories) 2021.
National coverage: 86% (excluding territories)
Map of this data (printable version) [1 page]
ADOLESCENT Participation Table
State/City
Percentage**Alabama**
77.1%**Alaska**
78.8%**Arizona**
88.9%**Arkansas**
96.8%**California**
81.2%**Chicago, IL**
74.9%**Colorado**
87.7%**Connecticut**
72.3%**DC**
115.6%**Delaware**
96.8%**Florida**
73.8%**Georgia**
96.8%**Hawaii**
61.8%**Houston, TX**
118.0%**Idaho**
79.9%**Illinois***
100.0%**Indiana**
90.4%**Iowa**
88.2%**Kansas**
78.6%**Kentucky**
89.0%**Louisiana**
96.8%**Maine**
115.0%**Maryland**
86.1%**Massachusetts**
96.3%**Michigan**
86.9%**Minnesota**
84.9%**Mississippi**
76.0%**Missouri**
71.2%**Montana**
81.8%**Nebraska**
86.0%**Nevada**
91.1%**New Hampshire**
46.5%**New Jersey**
78.4%**New Mexico**
96.2%**New York***
98.3%**New York City, NY**
111.9%**North Carolina**
89.5%**North Dakota**
85.3%**Ohio**
81.7%**Oklahoma**
77.2%**Oregon**
86.4%**Pennsylvania***
84.1%**Philadelphia, PA**
104.4%**Rhode Island**
90.6%**San Antonio, TX**
69.5%**South Carolina**
86.7%**South Dakota**
92.1%**Tennessee**
83.4%**Texas***
78.8%**Utah**
95.5%**Vermont**
93.4%**Virginia**
108.0%**Washington**
84.2%**West Virginia**
72.6%**Wisconsin**
86.4%**Wyoming**
75.4%
Show More
ADOLESCENT Participation Table 2
Territories
Percentage**American Samoa**
122.1%**Guam**
71.7%**Marshall Islands**
60.0%**Federated States of Micronesia**
62.8%**Northern Mariana Islands**
89.8%**Palau**
53.2%**Puerto Rico**
134.9%**Virgin Islands**
56.4%
Show More
Footnotes
* City-based IIS participation rates are reported separately from their respective states; state rates do not include city data in their values.
Reported annual fluctuations in child participation may be due to programmatic and/or technical changes to the immunization information system. The denominator used to calculate child participation numbers are drawn from the 2021 Census estimates for each state and city.
Source: Immunization Information System Annual Report, CY2021
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2021 ADULT Participation Table and Map
Percentage of U.S. Adults 19+ years with 1+ Adult Immunizations in IIS
Percentage of adults aged 19+ years participating in an immunization information system (IIS) in the United States (including all 50 states, five cities, and the District of Columbia, and eight territories) in 2021.
National coverage: 89% (excluding territories)
Map of this data (printable version) [1 page]
Adult Participation table
State/City
Percentage**Alabama**
51.4%**Alaska**
95.5%**Arizona**
103.3%**Arkansas**
117.0%**California**
78.5%**Chicago, IL**
79.2%**Colorado**
92.1%**Connecticut**
91.9%**DC**
48.6%**Delaware**
112.2%**Florida**
120.9%**Georgia**
100.5%**Hawaii**
61.8%**Houston, TX**
17.6%**Idaho**
96.5%**Illinois***
104.6%**Indiana**
89.0%**Iowa**
95.0%**Kansas**
109.1%**Kentucky**
96.3%**Louisiana**
101.3%**Maine**
99.0%**Maryland**
80.1%**Massachusetts**
107.3%**Michigan**
102.7%**Minnesota**
113.3%**Mississippi**
97.5%**Missouri**
90.6%**Montana**
108.1%**Nebraska**
109.7%**Nevada**
125.1%**New Hampshire**
73.4%**New Jersey**
16.1%**New Mexico**
118.5%**New York***
95.3%**New York City, NY**
110.2%**North Carolina**
59.1%**North Dakota**
99.5%**Ohio**
97.1%**Oklahoma**
93.9%**Oregon**
121.5%**Pennsylvania***
108.9%**Philadelphia, PA**
114.7%**Rhode Island**
86.9%**San Antonio, TX**
16.6%**South Carolina**
100.0%**South Dakota**
116.1%**Tennessee**
98.0%**Texas***
14.0%**Utah**
109.8%**Vermont**
112.2%**Virginia**
128.0%**Washington**
115.1%**West Virginia**
71.3%**Wisconsin**
111.5%**Wyoming**
108.6%
Show More
Adult Participation table 2
Adult Participation table 2
Territories
Percentage**American Samoa**
147.2%**Guam**
112.8%**Marshall Islands**
75.8%**Federated States of Micronesia**
108.1%**Northern Mariana Islands**
109.8%**Palau**
79.8%**Puerto Rico**
59.7%**Virgin Islands**
72.7%
Show More
Footnotes
* City-based IIS participation rates are reported separately from their respective states; state rates do not include city data in their values.
Reported annual fluctuations in child participation may be due to programmatic and/or technical changes to the immunization information system. The denominator used to calculate child participation numbers are drawn from the 2021 Census estimates for each state and city.
Source: Immunization Information System Annual Report, CY2021
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							Last Reviewed:  October 4, 2022						Source: 	National Center for Immunization and Respiratory Diseases
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About IIS
Functional Standardsplus icon
Version 4.1
Core Data Elementsplus icon
Core Data Elements For IIS Functional Standards v4.0
Historical Core Data Elements
Data Code Setsplus icon
CVX
CVX Mapped to Vaccine Groups
CVX Mapped to VIS
MVX
Product Name Mapped to CVX/MVX
NDC Crosswalk Tables
VIS Barcode Lookup Table
VIS URL Table
CPT Mapped to CVX
Fall Season Respiratory Vaccine Codes
IIS Technical Guidanceplus icon
HL7
Transport (SOAP)
Deduplication
Clinical Decision Support for Immunization (CDSi)plus icon
CDSi Training Material
IZ Gatewayplus icon
Overview
Information Sheet
Awardee Forum Q&As
Meaningful Use
Vaccine 2D Barcodesplus icon
Vaccine 2D Barcoding for Manufacturers
Vaccines Shipping with 2D Barcodes
Vaccine 2D Barcode Scanning for Vendors
Vaccine 2D Barcode Scanning Initiatives
Vaccine 2D Barcode Scanning Implementation Toolkit
CDC IIS Activitiesplus icon
MIROW
NIS-IIS Collaboration
Sentinel Sites
IIS Strategic Planplus icon
2018-2020
2014-2017
Contacts for IIS Immunization Records
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IIS Annual Report (IISAR)plus icon
Overview
Participation Rates and Maps
MMWR Articles on Annual Report Data
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1600 Clifton Road NE, Building 24
Mailstop A-19
Atlanta, GA 30333
iisinfo@cdc.gov
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