The Scania OmniCity single-decker has a rounded roof dome with a single-curvature windscreen and a separate destination display. The Euro IV version was known as the CN230UB or CN270UB, the 230 and 270 indicate the maximum power (in hp) of the engine. The earlier version of the single-decker OmniCity was known as the CN94UB. The single-decker OmniCity was first introduced in 2002 in right-hand drive for the United Kingdom market. OmniCities were sold to Italian operators in Milan and Venice, while in Spain, Valencian operator EMT purchased a total of 81 rigid Omnicities from 2000 to 2004. 50 Omnicities were also ordered in 2003 for service in Amiens, while fleets of OmniCities were sold to operators in Angers and Calais. In France, Parisian municipal operator RATP ordered over 300 OmniCities from 2006 to 2010 in both rigid 12m and articulated 18m lengths, the latter of which were operated on 'Orlybus' express services to Orly Airport. In Kraków, 15 articulated OmniCities were delivered from 2001 to 2003, while OmniCities also entered service in the cities of Koszalin, Konin, Grudziądz and Słupsk, where a batch of OmniCities running on ethanol fuel were delivered in 2007.
Two buses replacing accident-damaged models were also delivered to PKS in 2011. 108 rigid OmniCities were delivered to Warsaw operator PKS between 20.
OmniCities were also popular in many regions of Poland. OmniCities were also sold to the Estonian cities of Tallinn and Tartu. Omnicities were also sold to Concordia Bus in Norway, Linjebuss in Sweden, the Helsinki Public Transport Authority and to Strætó bs in Reykjavík. Some of these would later be sold on for further use in the Polish city of Koszalin in 2015. In Norway, Omnicities were delivered to operator Norgesbuss AS in 2006 for service in the capital Oslo. Omnicities were popular in most of the Nordic countries. The single-decker and articulated Scania OmniCity were popular in Continental Europe. With a total of more than 2200 units for the United Kingdom, the last few OmniCities were built in 2012.
The Scania Citywide was launched in 2011 as a replacement for the OmniCity, except for the right-hand drive markets, where Scania have chosen to rely on external bodywork manufacturers, including Alexander Dennis. In 2006, the OmniCity was upgraded from the 4-series to the new N-series, which also included a thorough facelift, with the large rectangular front headlamps being replaced by smaller, round items, and further tweaks carried out to the rear styling. Since then all have been built in Poland. Production in Silkeborg ended in early 2000, and Katrineholm in 2004, with only a few test buses in 2005 to 2006. From 1999 it was also built at the plant in Słupsk, Poland.
The first prototypes were built in the former DAB plant in Silkeborg, Denmark, and serial production continued there in 1997, joined by Scania's plant in Katrineholm, Sweden.
The OmniCity was introduced in September 1996 as the first product based on the 4-series bus range. The Scania OmniCity is an integrally constructed transverse-engined low floor city bus that was available from Scania on the European market between 19.