This study deployed a systematic method to develop and validate a measurement for the identity of Hong Kong people, reflecting the emerging localistic attitude in the city. Drawing on a two-dimensional identity model, a combination of cultural and civic domains, an operationalization for Hong Kong identity was derived to differentiate between 'HongKongese' and others with stronger Mainland-Chinese-oriented identity. Cultural attribute, such as language and choice of technology products, is found to be of paramount importance in identity confirmation. Anti-authoritarianism and proactive political participation are the two major discriminatory features in the civic domain. Social distance from Mainland Chinese is positively associated with these key components of the scale, supporting the scale's construct validity and confirming the nativist tendency of certain groups of Hong Kong localists. Copyright © 2019 Informa UK Limited, trading as Taylor & Francis Group.