Last Modified:  Data from https://support.apple.com/en-us/HT201634

The "xx" characters in model numbers are variables and will change by country. The rest of the information will be the same worldwide. 

Model Order Number Model identifier Model number Configurations
iMac (Retina 4K, 21.5-inch, Late 2015) A1418 iMac16,2 MK452XX/A TBA
iMac (21.5-inch, Late 2015) A1418 iMac16,1 MK142XX/A TBA
MK442XX/A TBA
iMac (Retina 5K, 27-inch, Late 2015) A1419 iMac17,1 MK462XX/A TBA
MK472XX/A TBA
MK482XX/A TBA
iMac (Retina 5K, 27-inch, Mid 2015) A1419 iMac15,1 M885XX/A TBA
iMac (Retina 5K, 27-inch, Late 2014) A1419 iMac15,1 MF886XX/A TBA
iMac (21.5-inch, Mid 2014) A1418 iMac14,4 MF883XX/A TBA
MG022XX/A TBA
iMac (21.5-inch, Late 2013) A1418 iMac14,1 ME086XX/A TBA
ME087XX/A TBA
iMac (27-inch, Late 2013) A1419 iMac14,2 ME086XX/A TBA
ME088XX/A TBA
iMac (21.5-inch, Late 2012) A1418 iMac13,1 MD093XX/A TBA
MD094XX/A TBA
iMac (27-inch, Late 2012) A1419 iMac13,2 MD095XX/A TBA
MD096XX/A TBA
iMac (21.5-inch, Mid 2011) A1311 iMac12,1 MC309XX/A TBA
MC812XX/A TBA
iMac (27-inch, Mid 2011) A1312 iMac12,2 MC813XX/A TBA
MC814XX/A TBA
iMac (21.5-inch, Mid 2010) A1311 iMac11,2 MC508XX/A TBA
MC509XX/A TBA
iMac (27-inch, Mid 2010) A1312 iMac11,3 MC510XX/A TBA
MC511XX/A TBA
iMac (21.5-inch, Late 2009) A1311 iMac10,1 MB950XX/A TBA
MC413XX/A TBA
iMac (20-inch, Early 2009) A1224 iMac9,1 MB417XX/A TBA
MC019XX/A TBA
iMac (27-inch, Late 2009)   iMac10,1 MB952XX/A TBA
MB953XX/A TBA
iMac (24-inch, Early 2009) A1225 iMac9,1 MB418XX/A TBA
MB419XX/A TBA
iMac (20-inch, Early 2008) A1224 iMac8,1 MB323XX/A TBA
MB324XX/A TBA
MB388XX/A TBA
MB391XX/A TBA
iMac (24-inch, Early 2008) A1225 iMac8,1 MB325XX/A TBA
MB393XX/A TBA
MB398XX/A TBA
iMac (20-inch, Mid 2007) A1224 iMac7,1 MA876XX/A TBA
MA877XX/A TBA
MB199XX/A TBA
MB200XX/A TBA
MA877XX/A TBA
MA876XX/A TBA
iMac (24-inch, Mid 2007) A1225 iMac7,1 MA878XX/A TBA
MB201XX/A TBA
MB322XX/A TBA
iMac (24-inch) A1200 N/A MA456XX/A TBA
iMac (20-inch, Late 2006) A1207 iMac5,1 MA589XX/A TBA
iMac (17-inch, Late 2006) A1208 iMac5,1 MA590XX/A TBA
iMac (17-inch, Late 2006 CD) A1195 iMac5,2 MA710XX/A TBA
17-inch iMac (Mid 2006), 1.83 GHz Intel Core Duo A1195 iMac4,2 MA406XX/A TBA
20-inch iMac (Early 2006), 2.0 GHz Intel Core Duo A1174 iMac4,1 MA200XX/A TBA
17-inch iMac (Early 2006), 1.83 GHz Intel Core Duo A1173 iMac4,1 MA199XX/A TBA
20-inch iMac G5 (iSight), 2.1 GHz A1145 N/A MA064XX/A TBA
17-inch iMac G5 (iSight), 1.9 GHz A1144 N/A MA063XX/A TBA
17-inch iMac G5 (Ambient Light Sensor), 1.8 GHz A1058 N/A M9843XX/A TBA
17-inch iMac G5 (Ambient Light Sensor), 2.0 GHz A1508 N/A M9844XX/A TBA
20-inch iMac G5 (Ambient Light Sensor), 2.0 GHz A1076 N/A M9845XX/A TBA
17-inch iMac G5, 1.6 GHz A1058 N/A M9248XX/A TBA
M9363XX/A TBA
17-inch iMac G5, 1.8 GHz A1058 N/A M9249XX/A TBA
M9823XXA TBA
20-inch iMac G5, 1.8 GHz A1076 N/A M9250XX/A TBA
M9824XX/A TBA