The UIDAI has been mandated to generate and issue unique identification numbers (AADHAR) to all the residents of India. Enrolment for Aadhar is voluntary and not mandatory. However, it is for the implementing authorities to decide whether Aadhar is mandatory for receiving a service.
UIDAI is authorized to enroll, through multiple Registrars upto 60 crore residents by March 2014 in 18 states/UTs which are given in table below.
| Sl No | States/UT |
| 1 | Andhra Pradesh |
| 2 | Chandigarh |
| 3 | Daman & Diu |
| 4 | Goa |
| 5 | Gujarat |
| 6 | Haryana |
| 7 | Himachal Pradesh |
| 8 | Jharkhand |
| 9 | Karnataka |
| 10 | Kerala |
| 11 | Madhya Pradesh |
| 12 | Maharashtra |
| 13 | NCT of Delhi |
| 14 | Puducherry |
| 15 | Punjab |
| 16 | Rajastan |
| 17 | Sikkim |
| 18 | Tripura |
The rest of the population will be covered by Registrar General of India (RGI) under the National population Register (NPR) process.
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