English language in Nigeria has the status as an official language that is used in local and international correspondences. One aspect of English grammar that is very hard for second language users including Nigerians to master is prepositions. Not only that English prepositions difficult, they are also the most frequently used items in newspapers that play an important role to signal political and cultural discourses. This study aims to describe the usage and communicative functions of spatial prepositions “in, on and at” in the headlines of four major Nigerian newspapers. Primarily, to achieve that the present study adopted Halliday’s Systemic Functional Linguistics. Data were collected through the analyses of 21 headlines from four selected major Nigerian newspapers. The findings revealed that Vanguard, a major Nigerian newspaper, has the highest percentage of the usage of target prepositions (26.86%), seconded by Punch (24.92%), followed by the Sun (24.27%), and lastly the lowest percentage, The Nation (23.95%). Also, it was revealed from the study that newspaper editors preferred to use preposition “at” (indicating specific location) but replaced it with preposition “in” (indicating broader location). Moreover, despite the frequent usage of preposition “in” in replacement of preposition “at”, they also preferred the forward position that expresses uncertainty compared to mid-ward and backward positions. This study concludes that people can be united ideologically especially on issues that foster nationalism through the use of newspaper headlines since newspaper headline is a new form of discourse that may initiate, sustain, and shape the political and other national agenda.