UPS的单号的组成形式为：1Z XXX XXX YY ZZZZ ZZZC
X = 寄件人的UPS账户号码（6位数）
Y = UPS服务等级号（2位数）（具体含义会在下面列出）
Z = 包裹的识别号 （7位数）
C = 校验位
UPS服务等级号含义 （即上面的Y字符）
01 UPS United States Next Day Air ("Red")
UPS次日达
02 UPS United States Second Day Air ("Blue")
UPS第二个工作日结束前送达
03 UPS United States Ground
UPS陆运
12 UPS United States Third Day Select
UPS第二个工作日结束前送达
13 UPS United States Next Day Air Saver ("Red Saver")
UPS次日达（空运）
15 UPS United States Next Day Air Early A.M.
UPS次晨达（空运）
22 UPS United States Ground - Returns Plus - Three Pickup Attempts
UPS陆运（最多派送三次）
32 UPS United States Next Day Air Early A.M. - COD
UPS次晨达（货到付款）
33 UPS United States Next Day Air Early A.M. - Saturday Delivery, COD
UPS次晨达（星期六派送，货到付款）
41 UPS United States Next Day Air Early A.M. - Saturday Delivery
UPS次晨达（星期六派送）
42 UPS United States Ground - Signature Required
UPS陆运（需亲笔签名）
44 UPS United States Next Day Air - Saturday Delivery
UPS次日达（星期六派送）
66 UPS United States Worldwide Express
UPS全球特快 （1-3个工作日送达）
72 UPS United States Ground - Collect on Delivery
UPS陆运（货到付款）
78 UPS United States Ground - Returns Plus - One Pickup Attempt
UPS陆运（只派送一次）
90 UPS United States Ground - Returns - UPS Prints and Mails Label
UPS陆运（打印回邮标签）
A0 UPS United States Next Day Air Early A.M. - Adult Signature Required
UPS次晨达（必须成人签名）
A1 UPS United States Next Day Air Early A.M. - Saturday Delivery, Adult Signature Required
UPS次晨达（星期六递送，必须成人签名）
A2 UPS United States Next Day Air - Adult Signature Required
UPS次日达 （必须成人签名）
A8 UPS United States Ground - Adult Signature Required
UPS陆运 （必须成人签名）
A9 UPS United States Next Day Air Early A.M. - Adult Signature Required, COD
UPS次晨达（必须成人签名，货到付款）
AA UPS United States Next Day Air Early A.M. - Saturday Delivery, Adult Signature Required, COD
UPS次晨达（星期六递送，必须成人签名，货到付款）