This is a partial list of unnumbered minor planets for principal provisional designations assigned during 1–15 September 2004. Since this period yielded a high number of provisional discoveries, it is further split into several standalone pages. , a total of 433 bodies remain unnumbered for this period. Objects for this year are listed on the following pages: A–B · C · D–E · F · G–H · J–O · P–Q · Ri · Rii · Riii · S · Ti · Tii · Tiii · Tiv · U–V · W–X and Y. Also see previous and next year.
R
|- id="2004 RC" bgcolor=#fefefe
| 0 || 2004 RC || MBA-I || 18.91 || data-sort-value="0.49" | 490 m || multiple || 2004–2021 || 02 Jun 2021 || 37 || align=left | Disc.: Table Mountain Obs. || |- id="2004 RS" bgcolor=#FA8072 | 0 || 2004 RS || MCA || 17.52 || data-sort-value="0.93" | 930 m || multiple || 2004–2022 || 25 Jan 2022 || 72 || align=left | Disc.: LONEOS || |- id="2004 RA1" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.88 || 1.1 km || multiple || 2004–2021 || 27 Nov 2021 || 124 || align=left | Disc.: George Obs.Alt.: 2017 TC3 || |- id="2004 RG1" bgcolor=#FA8072 | 0 || || MCA || 16.6 || 2.0 km || multiple || 1982–2021 || 08 Jun 2021 || 198 || align=left | Disc.: NEAT || |- id="2004 RW1" bgcolor=#FA8072 | 1 || || MCA || 18.1 || data-sort-value="0.71" | 710 m || multiple || 2004–2018 || 10 Jul 2018 || 73 || align=left | Disc.: LINEARAlt.: 2018 MK6 || |- id="2004 RM2" bgcolor=#fefefe | 0 || || MBA-I || 18.09 || data-sort-value="0.72" | 720 m || multiple || 2004–2019 || 30 Nov 2019 || 82 || align=left | Disc.: NEAT || |- id="2004 RV2" bgcolor=#FFC2E0 | 2 || || AMO || 20.7 || data-sort-value="0.26" | 260 m || multiple || 2004–2020 || 22 Mar 2020 || 121 || align=left | Disc.: LINEAR || |- id="2004 RW2" bgcolor=#FFC2E0 | 5 || || APO || 24.4 || data-sort-value="0.047" | 47 m || single || 11 days || 17 Sep 2004 || 64 || align=left | Disc.: LINEAR || |- id="2004 RC4" bgcolor=#fefefe | 0 || || MBA-I || 17.44 || data-sort-value="0.97" | 970 m || multiple || 2004–2021 || 01 Jul 2021 || 191 || align=left | Disc.: NEAT || |- id="2004 RF4" bgcolor=#E9E9E9 | 0 || || MBA-M || 18.1 || 1.0 km || multiple || 2004–2017 || 16 Aug 2017 || 36 || align=left | Disc.: NEAT || |- id="2004 RM4" bgcolor=#fefefe | 0 || || MBA-I || 17.9 || data-sort-value="0.78" | 780 m || multiple || 2004–2020 || 07 Dec 2020 || 158 || align=left | Disc.: NEATAlt.: 2007 NC4, 2010 KZ8, 2013 HT16 || |- id="2004 RN4" bgcolor=#E9E9E9 | 0 || || MBA-M || 16.46 || 1.5 km || multiple || 2004–2022 || 17 Jan 2022 || 297 || align=left | Disc.: NEAT || |- id="2004 RQ4" bgcolor=#fefefe | 0 || || MBA-I || 17.48 || data-sort-value="0.95" | 950 m || multiple || 2004–2021 || 13 Apr 2021 || 193 || align=left | Disc.: NEAT || |- id="2004 RJ5" bgcolor=#E9E9E9 | 0 || || MBA-M || 17.02 || 1.7 km || multiple || 2000–2021 || 23 Oct 2021 || 256 || align=left | Disc.: NEATAlt.: 2015 BZ438 || |- id="2004 RL5" bgcolor=#fefefe | 0 || || MBA-I || 17.5 || data-sort-value="0.94" | 940 m || multiple || 2003–2020 || 26 Feb 2020 || 139 || align=left | Disc.: NEAT || |- id="2004 RD6" bgcolor=#fefefe | 0 || || MBA-I || 17.33 || 1.0 km || multiple || 2003–2021 || 29 Apr 2021 || 127 || align=left | Disc.: NEAT || |- id="2004 RM6" bgcolor=#FA8072 | 0 || || MCA || 18.1 || data-sort-value="0.71" | 710 m || multiple || 2004–2020 || 21 Jun 2020 || 96 || align=left | Disc.: NEAT || |- id="2004 RR6" bgcolor=#d6d6d6 | 0 || || MBA-O || 16.05 || 3.4 km || multiple || 2004–2021 || 05 Dec 2021 || 159 || align=left | Disc.: NEATAlt.: 2015 PZ306 || |- id="2004 RK7" bgcolor=#E9E9E9 | 1 || || MBA-M || 18.18 || data-sort-value="0.69" | 690 m || multiple || 2004–2021 || 01 Dec 2021 || 53 || align=left | Disc.: NEATAlt.: 2021 RJ26 || |- id="2004 RF8" bgcolor=#fefefe | 0 || || MBA-I || 18.46 || data-sort-value="0.60" | 600 m || multiple || 2004–2021 || 30 Nov 2021 || 153 || align=left | Disc.: Altschwendt Obs.Alt.: 2011 UP317 || |- id="2004 RW8" bgcolor=#E9E9E9 | 0 || || MBA-M || 16.4 || 2.9 km || multiple || 1995–2020 || 23 Apr 2020 || 222 || align=left | Disc.: Goodricke-Pigott Obs.Alt.: 2013 RV18 || |- id="2004 RH9" bgcolor=#FA8072 | 0 || || MCA || 16.99 || 1.2 km || multiple || 2004–2021 || 02 Nov 2021 || 93 || align=left | Disc.: LINEARAlt.: 2008 LR16 || |- id="2004 RJ9" bgcolor=#FFC2E0 | 0 || || AMO || 19.67 || data-sort-value="0.37" | 400 m || multiple || 2004-2023 || 07 Jul 2023 || 68, || align=left | Disc.: LINEAR || |- id="2004 RL9" bgcolor=#FA8072 | 2 || || MCA || 19.3 || data-sort-value="0.41" | 410 m || multiple || 2004–2016 || 08 Jan 2016 || 76 || align=left | Disc.: LINEARAlt.: 2015 VB121 || |- id="2004 RM9" bgcolor=#FA8072 | 2 || || MCA || 19.3 || data-sort-value="0.41" | 410 m || multiple || 2004–2020 || 19 Aug 2020 || 51 || align=left | Disc.: LINEAR || |- id="2004 RP9" bgcolor=#fefefe | 0 ||