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We present a study of the cosmic infrared background, which is a measure of the dust‐obscured activity in all galaxies in the Universe. We venture to isolate the galaxies responsible for the background at 1 mm; with spectroscopic and photometric redshifts we constrain the redshift distribution of these galaxies. We create a deep 1.16 mm map ( σ∼ 0.5  mJy) by combining the AzTEC 1.1 mm and MAMBO 1.2 mm data sets in the Great Observatories Origins Deep Survey North (GOODS‐N) region. This combined map contains 41 secure detections, 13 of which are new. By averaging the 1.16 mm flux densities of individually undetected galaxies with  24 μm  flux densities  &gt;25 μ Jy, we resolve 31–45 per cent of the 1.16 mm background. Repeating our analysis on the SCUBA  850 μm  map, we resolve a higher percentage (40–64 per cent) of the  850 μm  background. A majority of the background resolved (attributed to individual galaxies) at both wavelengths comes from galaxies at   z  &gt; 1.3 . If the ratio of the resolved submillimetre to millimetre background is applied to a reasonable scenario for the origins of the unresolved submillimetre background, 60–88 per cent of the total 1.16 mm background comes from galaxies at   z  &gt; 1.3 .

Origins of the extragalactic background at 1 mm from a combined analysis of the AzTEC and MAMBO data in GOODS‐N